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0 - 9

0
Octal. A prefix: e.g., 0400 = 256. That's right: a leading zero in some contexts implies base eight. It just might cause confusion, someday, between Christmas (12/031) and Halloween (012/31).

0
Zero. The palindromic number with the smallest value. I suppose I might write more, but it might be appropriate to write nothing. Too late now. There's a positive integer that's sort of like 0 with grammatical aspect: 86.

Different Semitic alphabets have, to a great extent, the same letters in the same order. (Yes, we're still in the 0 entry. Keep reading.) The first letter of every Semitic alphabet is (AFAIK) the same, typically transliterated aleph for Hebrew and Aramaic, alif for Arabic, alep for Phoenician, etc. The earliest forms of the letter resembled an ox head, and the name of the letter meant ox. As the glyph became less of a picture and more of an abstraction, it came to look like a Roman (avant la lettre, if you will pardon the expression) capital letter A, or a numeral 4, knocked over on its side (usually knocked over to point left).

One of the most common changes that befell the glyphs of alphabetic characters was rotation. For example, the Roman letter L is essentially a capital lambda rotated a third of a turn counterclockwise. (In Etruscan and Oscan, it was rotated in the other direction, so it mirrored the Roman L, but Etruscan and Oscan were written right-to-left.) By the time the Greeks adapted some Semitic alphabet (probably the Phoenician), the early aleph was rotated into what we would recognize as an A. (And its name became alpha. That name, as pronounced by the ancient Greeks, would be transcribed by English-speakers as ``alpa.'')

The letter aleph is a sort of nothing consonant. In transliteration to Western languages, it usually disappears. The articulation that aleph represents is an unvoiced glottal stop consonant. At the beginning of a word, what aleph indicates to the usual European way of thinking is just that the word begins with a vowel. In the middle of a word, aleph may indicate the presence of a diphthong or hiatus, or it may be inserted as a hint (matres lectionis) to indicate a vowel ah.

Semitic languages do not generally indicate vowels, although many ``pointing'' systems (small marks surrounding the letters) were developed to indicate vocalization (vowels), cantillation, and punctuation. One system (or three), the Tiberian, became dominant in Hebrew starting around 1200 CE, and is used today for children's primers, poetry, and prayer books. Semitic languages don't have very many consonant clusters, so when you see the consonants of a word you have a pretty good idea where the vowels go. Various hints, and the simple fact that there are only so many words, make it possible to fill in the missing vowels. In Greek, on the other hand, not indicating vowels is not an option, but indicating the glottal stop was evidently not a priority. When the alphabet was adapted to Greek, characters were developed for six vowels, and aleph was retasked for the ah sound (and renamed alpha, as you know if you have any short-term memory).

In Hebrew, the name of the letter aleph is written aleph-lamed-phe. One other letter has a name that is spelled with an initial aleph: aleph-yod-nun, spelling ayin. Ayin is the sixteenth letter of the Hebrew alphabet, and I'll only get in trouble if I try to explain how anyone pronounces it, but it's one of those ``silent'' letters. In Hebrew, the word ayin means `nothing.'

0-ary function
An n-ary function with n equal to zero. A function with no explicit arguments. Not the same as a constant, because it might (in some usage) depend on arguments passed as global variables (including system variables like the time) or it may preserve state between calls (like a random variable seed). Also, its evaluation might have side effects different from a literal constant.

Let's face it, this is a stupid term, used by people who just want to be cute. If you mean a constant or a subroutine call, say that. If you want to be clever, contemplate n-ary functions with n not a natural number (negative integer or imaginary number is too easy; try a fractional argument count, then advance to irrationals).

True, a few negligible "()" (or ()-like) languages -- APL, awk, C, and Perl, possibly one or two others -- don't distinguish between function calls and subroutines. However, this doesn't release you from the commandment to call them by the proper names set down in the original FORTRAN definition as communicated to IBM by God.

Synonyms for 0-ary are nillary and nullary. The silliness of these terms confirms the inappropriateness of using the term function in these cases. If something is explicitly a function of nothing, then it's not a function of anything.

APL uses the -adic suffix to form its set of silly words -- niladic, monadic, dyadic, ... The advantage of this system is that monadic can be mistaken easily for monastic and nomadic. The usage also happens to coincide (from dyadic and triadic on) with a conventional terminology for linear matrix operators. APL is (or was when implemented) very strong on matrix operations.

0DEG
Zero-Dimensional Electron Gas. A quantum dot.

0x
Hexadecimal. A prefix: e.g., 0x0400 = 1024.

000
A placeholder for a number expected to be filled in. Old convention popular among reporters. Also used in book editing for cross-reference page numbers. See also TK and XX.

0.005
Title II Section 2 of the National Prohibition Act set the standard for intoxicating beverages as ``one-half of one per centum ... of alcohol by volume.''

012
A minyan in octal.

0211
137 in octal.

05
Five in octal. Also a common way of coding o5 (q.v.).

0.673
The Rorty Factor. This is explained in ``The Quest for Uncertainty: Richard Rorty's Pragmatic Pilgrimage,'' an article by James Ryerson that appeared in the Dec. 2000/Jan. 2001 issue of Lingua Franca. The following is on page 44:
... My own experience suggests that you can use Rorty as a great source on difficult thinkers like Heidegger or [Wilfred] Sellars,'' says [Daniel] Dennett. ``And if you multiply what he says by the number .673''--which Dennett playfully calls the ``Rorty Factor''--``then you get the truth. Dick always exaggerates everything in the direction of the more radical.''

      Stauncher critics maintain that the Rorty Factor is considerably smaller. As the New York University philosopher Paul Boghossian remarks, Rorty faces the perilous task of rejecting the notion of objective truth while avoiding the charge that his own views are thus untrustworthy. ``I just think he has never really pulled off the trick,'' Boghossian says. ``I don't think that anybody has, but in particular I don't think that he has.''

I haven't seen any numerical estimates of the O'Reilly Factor. I did, however, see the figure of $60,000,000 bruited about.

0.73908513321516064165531208767
Approximate value of the unique number equal to its own cosine. (In radians, of course.)

0.860333589019379762483893424137662
Approximate value of the smallest positive number equal to its own cotangent. Equals 1/1.16233983278487820393010444406928

0xA
A minyan in hexadecimal.

0x89
137 in hexadecimal.

1
One. The smallest palindromic positive integer. The multiplicative identity. Holder of many other important distinctions.

Blackballed from the prime numbers fraternity. (Why not admit that the only positive factors of 1 are 1 and itself?)

1
Huh? Oh -- you don't mean ``one,'' you mean ``one''! According to one's website,
'one' is the new railway franchise for the East of England, providing all services from London Liverpool Street.

To maximize confusion, they don't capitalize the name. Obviously, this name was chosen because it was the one with the greatest comedic possibilities. They plan to take the show on the road.

``It's almost seven twenty-one! Of course you've missed the seven-twenty one train. Please be more prompt.''

Obviously this sort of thing can only be confusing four times an hour (not counting ``seven-thirteen one,'' etc.). But they have other ways of making you late. ``I'm sorry: if you want to buy a ticket for one, then I can only sell you a ticket for one. Tee-hee! One way?''

The one naming began on one April two thousand and four, probably because this was so cute, with the name and day and all. Tra-la! On day one, the new name was a little cute and a lot stupid. The next day, it was no longer cute. It's a miracle if they haven't renamed at least one station ``next.'' (You know sometimes nowadays they give ballplayers peculiar names.)

I say, pronounce it as it's spelled: ``own.''

1B, 1b
Baseball term:
  1. First Base[man].
  2. Hit for a single.

1BASE-5
CSMA/CD protocol for communication at rates up to 1 MBps over baseband (i.e., unmultiplexed) medium.

1BASE-T
CSMA/CD protocol for communication at rates up to 1 MBps over twisted pair.

1DEG
One-Dimensional Electron Gas. A quantum wire.

1DHG
One-Dimensional Hole Gas. A quantum wire.

1/e
First Edition.

Collectors tend to go principally for these, except in the case of very early or otherwise very rare or valuable books. To a collector, the first edition is really the first printing of the first edition, or at worst the first edition in the strictest sense (i.e., excluding any print runs in which any minor typographical corrections may have been made).

Book-club editions are generally reprints, more cheaply bound than the original, with very little collector value. They are often marked ``First Edition.'' A strong sign that a volume is a book-club edition is a blind stamp (usually a small square or circle on the back cover).

Umm, we're talkin' hardcovers here, you know. When the paperback was invented early in the twentieth century, it was for cheap reprints of, err, quality books, and for cheap potboilers and such. It was only late in the century (1980's, say) that quality mass-market books began to have paperback first editions. Nevertheless, there appears to be a significant market for 1950's science fiction in paperback.

A good place to find out what a used book is worth is <BookFinder.com>. Although that is not specialized in collectors editions, it can search the inventories of over 30,000 used-book stores. A common reference for collectors is the annual Huxford's Old Book Value Guide. For more on finding books, new and used, see our Books Stores entry.

1GL
First-Generation Language. Machine language. The terminology did not come into use until there were three generations. See 3GL entry for more explanation.

1H, 1H
Hydrogen isotope with A=1. Protium: one proton, one electron. Good old hydrogen. Good stuff. Extremely popular with NMRtians.

Good old theoretical hydrogen, anyway. Good old conventional practice also doesn't distinguish carefully between 1H and H. Commercially available hydrogen is a mix of isotopes. ``Ultra-depleted'' protium water is available on the market with deuterium concentration as low as 1 ppm.

In the late eighties IUPAC promulgated some systematic nomenclature for discussing hydrogen species and processes specifically and generically. The terms included hydron as a generic hydrogen nucleus, modeled very reasonably on the pattern of proton, deuteron, and triton. Excuse me while I go and express my opinion of this name to the porcelain throne.

If that link is dead, see

  1. IUPAC-IUB Joint Commission on Biochemical Nomenclature (JCBN), and Nomenclature Commission of IUB (NC-IUB), Newsletter 1989; Arch. Biochem. Biophys., vol. 272, pp. 262-266 (1989); Biochem. Internat., vol. 20, pp. 209-214 (1989); Bioch. J., vol. 265, I-IV (1989); Biol. Chem. Hoppe-Seyler, vol. 370, pp. 1153-1156 (1989); Eur. J. Biochem., vol. 183, 1-4 (1989).
  2. IUPAC Commission on Physical Organic Chemistry (CPOC) Names for hydrogen atoms, ions, and groups, and for reactions involving them, Pure Appl. Chem. vol. 60, 1115-1116 (1988).

Oh, what the hey, here's the lot, with further (SBF) recommendations:

General1H2H3H Oh, it was an eta?
Atom (H)hydrogen protium deuterium tritium William
Cation (H+)hydron proton deuteron triton Neptune's
Anion (H-)hydride protide deuteride tritide neap tide
Group (-H)hydro protio deuterio tritio Trimalchio
Transfer of cation to substratehydronation protonation deuteronationtritonation detonation, pronation, alien nation
Replacement of hydrogen by a specific isotopeprotiation deuteriation
(or deuteration)
tritiation adulteration, titillation, deterioration

1L
First-year Law School student. Cf. L1.

1N
Common diode designation. It does seem that all the low numbers were used up on Germanium diodes.

1NF
First Normal Form.

1 photon
It is often said that the human eye has the ability to detect a single photon. This is true in a limited sense not usually understood.

A dark-adapted human eye can detect a light flash at a threshold of about 100 photons at the cornea. Only about half of those make it to the retina; maybe 30 are absorbed by rods in the retina (evolution has left us with the rods pointing backwards, so light has to go not just to but partly through the retina). The usual claim (in a correct formulation) is that a rod can detect a single photon. This only means that in the conscious detection of a single light pulse, the various rods that contribute to the nervous signal each react to the absorption of only one photon each (in most detection events). One rod detecting one photon would not register consciously: the retinal as well as the cerebral circuitry conspire to ignore low-level signals that could as well be noise.

The actual quantum efficiency of rods is hard to measure, but seems to be about 50%. I.e., there's about a 50% chance that if a single photon is absorbed by a rod, it will produce an elementary electrical signal.

Rod response is delayed by about 0.2 seconds; cone response by 0.1 sec or less. Actually, this is peak response. If you imagine that you ``trigger'' on the leading edge when current shift exceeds noise level by a factor of two, the numbers are more like 0.15 and 0.05 sec, resp.

Details can be found in Stevens' Handbook of Experimental Psychology, 2/e, Vol. 1, (1988) pp. 125ff. Thresholds for conscious awareness or detection of light are determined in human experiments. For ethical and practical reasons, however, other components of this research are done with vertebrates such as frogs and monkeys. Nocturnal animals presumably have better overall response.

1Q
First Quarter. Of the year -- fiscal, academic, calendar, whathaveyou.

1Q
First Qumran cave.

1Q Apoc
The Genesis Apocryphon from the first Qumran cave (1Q). Edited by Nahman Avigad and Y. Yadin (1956).

1QH
Hodayot or `Thanksgiving Psalms' from the first Qumran cave (1Q). Edited by Eleazar Lipa Sukenik (1889-1953) and Nahman Avigad, Otsar ha-Megillot ha-Genuzot (Jerusalem, 1954).

1QIsa
Scroll of ISaiah from the first Qumran cave (1Q). Edited by Millar Burrows, et al., Dead Sea Scrolls of St. Mark's Monastery, vol. 1 (New Haven: American Schools of Oriental Research, 1950). (Volume 1 contains the Isaiah manuscript and the Habakkuk commentary [see also 1QSa and 1QSb]; vol. 2, fasc. 2. Plates and transcription of the Manual of Discipline.)

1QIsb
Scroll of ISaiah from the first Qumran cave (1Q). Edited by Eleazar Lipa Sukenik and Nahman Avigad, Otsar ha-Megillot ha-Genuzot (Jerusalem, 1954).

1QM
Serekh ha-Milhamah or the War Scroll from the first Qumran cave (1Q). Edited by Eleazar Lipa Sukenik and Nahman Avigad, Otsar ha-Megillot ha-Genuzot (Jerusalem, 1954).

1QPhyl
PHYLacteries or Tefillin from the first Qumran cave (1Q). Edited by Y. Yadin, in Eretz Israel, vol. 9 (1969), pp. 60-85. ``Phylacteries'' is not the title of the text, it's what the text was found in. Phylacteries have contained somewhat varying Agghhh!!!!! My connection is excruciatingly slooooowwww!!!! I think I'll insert the rest of this at 4AM someday.

Okay, quickly now, before the system hangs: Phylacteries are boxes and leather straps that one (one Orthodox Jew, actually, in the only instances I'm aware of) wears while saying a prayer to the effect that the prayer shall not be forgotten. It's sort of a self-referential performative statement. (And the Talmud is a paper hypertext, but that's another entry.) The boxes contain a scrap or two of prayer, but which prayer has varied a little. It hasn't always been the prayer that you will use phylacteries.

Tefillin is an Aramaic plural, not Hebrew, which is why it ends in the en nasal consonant (like Arabic male plurals) instead of em (i.e., instead of ending in the Hebrew male plural inflection -im).

1QS
Serekh ha-Yahad or `Manual of Discipline' from the first Qumran cave (1Q). Edited by Millar Burrows, et al., Dead Sea Scrolls of St. Mark's Monastery, vol. 2 (New Haven: American Schools of Oriental Research, 1951). (Volume 1 contains the Isaiah manuscript and the Habakkuk commentary; vol. 2, fasc. 2. Plates and transcription of the Manual of Discipline.)

Cf. 4QSf, 7QaskY.

1QSa
Serekh ha-Edah or `Rule of the Congregation' from the first Qumran cave (1Q). Edited by Millar Burrows, et al., Dead Sea Scrolls of St. Mark's Monastery, vol. 1 (New Haven: American Schools of Oriental Research, 1950). (See also 1QIsa and IQS.)

Originally designated 1Q28a, in connection with which, see the next entry.

1QSb
Divrei Berakhot or `Blessings' from the first Qumran cave (1Q). Edited by Millar Burrows, et al., Dead Sea Scrolls of St. Mark's Monastery, vol. 1 (New Haven: American Schools of Oriental Research, 1950). (See also 1QIsa and IQS.)

The numbering of these items is pretty addled, as you can see. The ``S'' in 1QSb comes from the fact that this was originally called 1Q28b, and the original 1Q28a became 1QSa.

1QT
The Temple Scroll from the first Qumran cave (1Q).

1Q28
Just look at 1QSa and 1QSb, willya? All those superscripts are tiring my fingers.

1-RM
One-Repetition Maximum. A measure of strength. The maximum intensity at which a person can perform an exercise once. (For free weights and the simpler constant-resistance machines, intensity is a weight or torque.) Since one rep normally takes less than a few seconds, energy used by a test subject's muscles in a test of 1-RM comes mostly from the breakdown of stored intramuscular high-energy phosphates, ATP and CP.

1X
Original speed of CD-ROM drive data transfer was 150 Kbps.

10
Check out David Letterman's `` Top Ten Numbers From One To Ten.''

(A rerun of `` Top Ten Numbers From One To Ten.'')

10-
Ten-codes are forms of verbal shorthand that have arisen informally; a number of standardization efforts have been made by various radio organizations. The FCC requires CB-ers to keep a written list of the codes with the CB set if they use CB codes at all. Law enforcement uses a similar but not quite identical set of codes. We serve a list of both major ten-codes.

10-RM
Ten-Repetition Maximum. A measure of strength. The maximum intensity at which a person can perform an exercise ten times. Generally speaking, 10-RM is less than 1-RM, q.v.

100
In 1931, a book was published at Leipzig entitled Hundert Autoren gegen Einstein (`A Hundred Writers against Einstein'). Famously, when Einstein heard about it he remarked that if he were wrong, one would have been enough. See also 93.

100
Ten squared.

When [Jorge Luis] Borges's mother, doña Leonor Acevedo, dies at age 99, she has already lain weak and prostrate on her bed for quite a while. Her moans had filled the house. One unimaginative person, expressing his condolences to Borges, said it was a shame that she was unable to reach the century mark. So Borges replied, ``it seems to me that you exaggerate the charms of the decimal system....'' (According to Alicia Jurado, 1980.)

(Look, don't complain about the translation. A more literally accurate translation would contain and suppress information, and use modes of expression unusual in English, that would seem inappropriately odd in ways that the original is not odd.)

From Borges Verbal, by Pilar Bravo and Mario Paoletti (Buenos Aires: Emecée, 1999), p. 183:

Cuando muere la madre de Borges, doña Leonor Acevedo, a los noventa y nueve años, llevaba ya tiempo tullida y prostrada en la cama. Sus ayes se oían por toda la casa. Una persona sin imaginación, al darle pésame a Borges, le dijo que era una pena que no hubiera podido llegar a los cien años. Y entonces Borges le contestó: ``Me parece que usted exagera los encantos del systema decimal...''
(Contado por Alicia Jurado, 1980).

(Borges Verbal is an alphabetized selection of excerpts from interviews of Borges. There also exist alphabetized selections of his published opinions, and he himself published an alphabetized selection of his opinions. It seems to be catching. Since I first put in this entry, two relevant things have happened. (1) In Chile, my aunt Laura died somewhat shy of her 103rd birthday, and (2) right here in the virtual country inhabited by your faithful glossarist, I discovered that the authors of Borges Verbal sometimes took surprising liberties with Borges's words as originally published. For example, Bravo and Paoletti's entry for Germany includes the following sentence (pp. 38-9):

Lo que también se da en los alemanes es el respeto de la autoridad, una suerte de respeto chino de las jerarquías, (olvidando) que las jerarquías se deben al azar.

This sentence comes from the third of seven interviews Borges granted to Fernando Sorrentino, transcribed from tape and first published in 1974. Borges Verbal gives the source as [Siete conversaciones con Jorge Luis Borges (Buenos Aires: El Ateneo)]. (The 1996 edition is cited; I checked the 1973 and 2001 editions, where the relevant text is at pp. 64 and 124, resp.).

Lo que también se da en los alemanes --y lo que ciertamente no se dio en Schopenhauer-- es el respeto de la autoridad, una suerte de respeto chino de las jerarquías, el hecho de darles una gran importancia a los títulos de las personas. Creo que, en ese sentido, somos mucho más escépticos que los alemanes: comprendemos que las jerarquías se deben a las circunstancias y que las circunstancias se deben al azar.

100
The top 100 holdings list of US libraries, according to the OCLC, is served here.

10-bagger
A company returning 1000% return on investment (ROI) -- venture-capital jargon.

10BASE-T, 10baseT
Protocol for communication at rates up to 10 MBps over Twisted-pair unshielded (i.e. intrinsically noisy) cable. Part of the IEEE 802.3 standard, which defines the Media Access Control (lower sublayer of Data Link Layer) as well as the physical layer.

10BASE-2, 10base2
Protocol for communication at rates up to 10 MBps over 200-meter segments of thin coax cable (1/4-in. diam. coax). Strictly speaking, it's supposed to be used for distances up to 185 meters; think of it as 200 yards and a little over an inch, if round-up bothers you more than God's righteous units.

Part of the IEEE 802.3 standard. ``ThinNet'' or ``CheaperNet.''

10BASE-36
Protocol for communication at rates up to 10 MBps over 3600-meter segments of thick coax cable. Part of the IEEE 802.3 standard.

10BASE-5
CSMA/CD protocol for communication at rates up to 10 MBps over 500-meter segments of thick coax cable (0.4-in. diam.). Part of the IEEE 802.3 standard.

10K
Popular ECL family for SSI. For low fan-out (i.e., with low capacitive loading), propagation delays are on the order of 1.5 nsec. The output stage is a pair (for inverted and noninverted output) of emitter followers, so fall time is longer than rise time, and tPHL (propagation time of signal which sends output voltage from high to low) is longer than tPLH.

10K
Ten Kilometers. A common footrace distance, and the name of the race.

10Q
Rebus for thank you.

100BASE-X
CSMA/CD protocol for communication at rates up to 100 MBps over supported by the Fast Ethernet Alliance.

100BASE-T
Protocol for communication at rates up to 100 MBps over Twisted-pair unshielded (i.e. intrinsically noisier than coax) cable. Part of the IEEE 802.3 standard, which defines the Media Access Control (lower sublayer of Data Link Layer) as well as the physical layer.

100K
Successor to 10K, uses advanced fabrication techniques. It has symmetrized (``compensated'') OR and NOR VTC's, and voltage levels less sensitive to supply voltage and temperature. With low fan-out, propagation delays are on the order of 0.5 nsec. The power-delay product is improved over 10K (although still not as small as AS-TTL).

101
In the majority of American colleges and universities that use a semester system (and that's most I'm familiar with), courses are most compactly referred to by a two-part code: the department name (or its abbreviation) and a three-digit number. (Sometimes ``department'' is some other sort of instructional unit, such as a foobar studies program.) Some schools use a similar system with four-digit numbers. Perhaps the best-known exception to the rule is MIT (it's not a university but an ``institute'' anyway), which uses decimal numbers with an integer part specifying the department and a fractional part the course.

A majority of schools that use the three-digit numbers also use the hundreds digit to indicate level. Introductory courses are usually 100-level, occasionally 200-level, upper-level courses 300, 400, and graduate courses 500 and up. It's not just informative; it also simplifies the formulation of course requirements and course-credit rules. There is also a tendency for the smaller values of the two-digit remainder after the hundreds to be allocated first to the most fundamental or essential courses within a department's discipline, with narrower-interest courses being assigned larger-decade numbers (if only because they were introduced later). So a course numbered 101 is an introductory-level course, typically in a basic or general-interest topic. Courses are also (informally and sometimes officially) called by number with the course subject or short title rather than the department -- e.g., ``Mechanics 101,'' taught by a physics or mechanical engineering department. The preceding ought to pretty much explain the practice of suggesting that something is elementary knowledge by referring it to a fictitious course like ``Turning-on-your-flashlight 101.'' (Cf. Falling on the Floor.)

Don't tell me all this is obvious, or I'll just bleat on explaining more, such as that ``zero-hundred'' numbers (001, 002, ... 099) are widely used for remedial courses. In fact, I'd like to point out that odd numbers are normally used for Fall-semester courses and even numbers for Spring, when it is possible to do this (which is usually), and successive semesters of year-long sequences (especially of lower-level courses) typically have consecutive numbers. Most Summer courses are accelerated versions of regular-semester courses, so they can be assigned their usual numbers. I'm explaining the obvious because someone from outside North America actually emailed me asking what that 101 stuff meant. Don't hold me to the prevalence judgments (``most,'' ``usually,'' ``sometimes,'' etc.); I'm just writing this off the top of my head after spending more than half my life in universities. You could say I spent my life preparing for this moment, and now that it's over, I don't know what to do with myself any more. Of course, you could say a lot of things, but this one isn't quite true. My mission continues!

101
Internetese? Probably LOL (Laughing Out Loud).

10,12,15,18,22,27,33,39,47,56,68,82
What is it about these numbers that they are such popular choices for stock resistor and capacitor values?

Here is a historical hypothesis: given that the manufacturer must service a few orders of magnitude of resistance, there is some advantage in minimizing the number of different values used. One achieves this by selecting a largest allowable ``distance'' between resistor values, so there will always be a standard value that is ``close,'' and making a set of resistors whose values are ``equally spaced.'' The metric that one uses to measure distance in resistance values is fractional deviation. That is, logarithmic difference (the logarithm of the ratio). Concretely, a 5-ohm deviation from a 22-ohm resistor is as significant as a 50-ohm deviation from a 220-ohm resistor. Therefore, stock resistance values should be equally spaced on a logarithmic scale. This is what has been done here, so successive resistance values are in an approximately constant ratio [10(1/12) = 1.2115]. This is shown in the first column below.

10/8.2= 1.220
12/10 = 1.200  (11/10 = 1.100, 15/11 = 1.364) (13/10 = 1.300, 15/13 = 1.154)
15/12 = 1.250  (14/12 = 1.166, 18/14 = 1.286) (16/12 = 1.333, 18/16 = 1.125)
18/15 = 1.200  (17/15 = 1.133, 22/17 = 1.294) (19/15 = 1.267, 22/19 = 1.158)
22/18 = 1.222  (21/18 = 1.166, 27/22 = 1.227) (23/18 = 1.278, 27/23 = 1.174)
27/22 = 1.227  (26/22 = 1.182, 33/26 = 1.269) (28/22 = 1.273, 33/28 = 1.179)
33/27 = 1.222  (32/27 = 1.185, 39/32 = 1.219) (34/27 = 1.259, 39/34 = 1.147)
39/33 = 1.182  (38/33 = 1.152, 47/38 = 1.237) (40/33 = 1.212, 47/40 = 1.175)
47/39 = 1.205  (46/39 = 1.179, 56/46 = 1.217) (48/39 = 1.231, 56/48 = 1.167)
56/47 = 1.191  (55/47 = 1.170, 68/55 = 1.236) (57/47 = 1.212, 68/57 = 1.193)
68/56 = 1.214  (67/56 = 1.196, 82/67 = 1.224) (69/56 = 1.232, 82/69 = 1.188)
82/68 = 1.206  (81/68 = 1.191,100/81 = 1.235) (83/68 = 1.221,100/83 = 1.205)

The question arises whether one could do better. The answer depends on precisely what one takes as a measure of goodness. Part of the answer is that in twelve independent ratios in a decade, equal numbers are above and below the target value. Another way is to consider the effect of making a single change. The columns of parenthesied quantities show what would be the effect, on ratios with adjacent values, of changing any single value by one unit. For example, the fourth row begins with the ratio of the fourth (18) to the third (15) numbers. The next column in that row shows the effect of taking a smaller value (17) for the fourth number, and the last column shows the effect of increasing it.

Typical interpolated sequence for high-precision resistors (e.g. carbon film): 10, 11, 12, 13, 15, 16, 18, 20, 22, 24, 27, 30, 33, 36, 39, 43, 47, 51, 56, 62, 68, 75, 82, 91.

1045
Today I saw an AOL promotion: a CD in a glossy sleeve offering 1045 hours of free internet access. I don't know how they came up with that number. I also noticed, in smaller print, that the 1045 hours were for a period of 45 days -- i.e. 23 hours, 13 minutes, and 20 seconds per day for 45 days. I guess they figure you need some down time to brush your teeth.

But thinking about it, I wonder if it really takes all that long to brush one's teeth. I think a reasonably conscientious person spends less than thirty minutes per day brushing her teeth. Why not offer a more generous 1050 hours, or even 1065 for denture-wearers? Heck, they could offer 1080 hours, for people who brush while browsing!

(x*24 = 1000 + x: x = 1000/23 = 43.478260869565217391304347826087)

1.06µm, 1.064µm
Popular Nd:glass laser frequency. Used inter alia to lock CO2 lasers to 10.6µm

1080
Sodium Fluoroacetate. (From an old laboratory serial number.)

11
The neglected prime. Oh, it had its moment. It was a prime factor, and the biggest, in the number of feet in a mile, and the number of foot-pounds in a horsepower unit.

11
Designates advanced CMOS logic (``AC'' and ``ACT'') with center ground and power pins (i.e., ``AC11'' and ``ACT11'').

11QPsa
A scroll fragment containing a number of PSAlms, found in the Qumran Cave 11. This was found in 1956 and unrolled in 1961. The surviving fragment is the top of five text columns, about 18 cm high and 71.5 cm across, dated to about 30-50 CE. It is a liturgical collection, and includes various psalms and hymns, including at least part of 41 known biblical psalms, as well as a number of previously unknown psalms. The parchment is the thickest of any of the scrolls, and may be calfskin rather than the more common sheepskin. It wouldn't be hard to do the DNA analysis, but it's not clear how much the information would buy you.

This scroll fragment, also designated 11Q5, was the largest shown at the Public Museum of Grand Rapids (Michigan) during the exhibit February 16 through June 1, 2003.

11Q5
Another name for 11QPsa, q.v. This scroll fragment was the largest one chosen to be shown at the Public Museum of Grand Rapids during the exhibit February 16 through June 1, 2003. Also in the exhibit: eleven other scroll fragments from Qumran caves 4 and 11, and a variety of artifacts.

If you've never heard of it, and also if you have, it may occur to you that Grand Rapids (GR), in uh, Michigan somewhere, is not exactly a major venue. I imagine that it was selected for the 2003 tour to draw visitors in an area with proven reserves of interest -- a Dead Sea scrolls exhibit at Chicago in 2000 attracted 300,000 visitors. Original plans for 2003 had the exhibit traveling to Salt Lake City and Houston, but the other cities found the security arrangements too expensive (2003 came after 2001, you know) and pulled out, so GR became the only stop. I invited a girl I like to go on a date there, and we're going tomorrow. I understand that normal people take their dates to movies and dinner after. Well, I may be a freak, but I'm not alone. Afterwards she'll attend a town planning council meeting. (Is this romantic? You bet! See the ISO 9000 Certification entry.) I also mentioned GR at the 86 entry.

I, well, I just came back around to pass a feather duster over the entry. I stopped seeing the girl after that Grand Rapids date. Okay, honestly? The girl stopped seeing me. Or returning my calls and emails. I didn't even see the break-up coming! Was it that I didn't bring flowers? Was it the velcro sneakers? Why won't you tell me!?

I'm so depressed. But no hay mal que por bien no venga. (Spanish for `every cloud has a silver lining.') As I was driving out of the Grand Rapids museum parking lot, undistracted by small talk, by mindless chatter, I discovered that the Gerald R. Ford Museum and Presidential Library is visible across the street. So now I can tell people that I saw the Gerald Ford Museum.

11's
See las onces.

11-S
El once (11) de Septiembre. Standard Spanish designation of 9/11 (`September eleven').

11th
The eleventh edition of the Encyclopaedia Britannica (EB), from 1910, is the great one which established a reputation that editors of subsequent editions have worked hard to destroy.

111
Hobbits are rather longer lived than humans; the eleventy-first birthday is a popular one for a big celebration. Coming-of-age is at 33. Man, that's a long time to go without a drink. And the Brandywine flows right through that country. (Cf. 77.)

What kind of a crazy name is ``Frodo''???? That's too much to swallow. Nobody could believe something like that!

1.1141571408719300873005251781692
Approximate value of the smallest positive number equal to its own cosecant.

1.16233983278487820393010444406928
Approximate value of the smallest nonnegative number equal to the tangent of its own inverse. (For convergence, iterate using the map xn+1 = 1/arctan(xn.)

Equals 1/0.860333589019379762483893424137662

118
First three digits of six-digit telephone numbers for directory assistance (DA) in the UK. See 192.

119
You can hotwire news service by simply telneting to your news server at port 119. Of course, it helps if you know the protocol.

1.19967864025773383391636984864114
Approximate value of the smallest nonnegative number equal to its own hyperbolic cotangent.

12
Brand name of a terrific Ouzo. (Brief testimonial here.)

[column] Less recent thoughts about the number 12 (in, like, Babylonian, Greek, and Jewish, Christian and Muslim traditions) can be found in Annemarie Schimmel: The Mystery of Numbers (New York, Oxford: Oxford University Press, 1994) pp. 192 - 202. [Originally published in German as Das Mysterium der Zahl (Munich: Eugene Diederichs Verlag, 1984).] (Cite furnished by Antreas P. Hatzipolakis.)

Herodotus II.4:

    But as regarding human affairs, this was the account in which they all agreed: the Egyptians, they said, were the first men who reckoned by years and made the year to consist of twelve divisions of the seasons. They discovered this from the stars (so they said). ----- Further, the Egyptians first used the appellations of twelve gods which the Greeks afterwards borrowed from them.

(Thanks to Bob Bazemore for this posting to the Classics list.)

Off the top of his head [and possibly with some help from Matz: Ancient World Lists and Numbers (McFarland, 1995)], Dr. R. Laval Hunsucker mentioned the following even dozens from classical antiquity

  12 Titans
  12 Herculean labors
  12 cities of the Ionian League
  12   "     "  "  Achaean  "    (originally)
  12 tribes of the Delphic Amphictyonic Council
  12 vultures of Romulus
  12 Tables
  12 Fratres Arvales
  12 lictors
  12 scripta
  12 racing chariots (Circ. Max.)
  12 books of the Aeneid
  12   "    " Martial
  12   "    " Quintilian
  12   "    " Colum. De re rust.
  12 Caesars of Suet.

12mo
Duodecimo [<L. (ablative) a twelfth], twelvemo. Size of paper (and books made thereof) obtained by dividing a standard printer sheet into twelve parts to give 5 by 7¾ inch pages.

12-string
We're going to get formal on you: vide twelve-string.

13
A number that is superstitiously associated with bad luck in the West.

The technical term for fear of thirteen is triskaidekaphobia. The technical term for fear of Friday the thirteenth is paraskevatriskaidekaphobia, q.v. Both terms are constructed in Ancient Greek (the second term is paraskevidekatriaphobia in Modern Greek) but the superstition that Friday the thirteenth is ill-favored is foreign to Greece. On the other hand, there is a superstition that Tuesday the 29th is ill-omened, ever since Constantinople fell to the Turks on that day in May 1453.

One obvious reason why the number 13 would be considered unlucky in general does go back to, or through, the Greeks. The Pythagoreans distinguished deficient, abundant, and perfect numbers depending on whether the sum of their distinct factors is less than, more than, or equal to the number itself. (In order to make this definition nontrivial, the number itself is excluded from the sum. the factor of one, however, is counted.) (Even before the precise definitions were set, however, some inchoate notion of abundant numbers must have existed, and perhaps motivated the adoption of base-12 and -60 systems of measurement units and number representation.)

Prime numbers are maximally deficient, of course, in the sense that the sum of their factors, as defined, is 1. The number 13 is unusual in the circumstance of being a most deficient number following a very abundant number (that would be 12). Great deficiency following great abundance sounds like bad luck indeed.

13C
Carbon isotope with A=13. Very popular with NMRtians.

13013
Just now, we had exactly 13013 entries. For those who would find that worrisome, I have corrected the situation with the addition of this entry.

14-pin package
A typical 14-pin package for 54/7400-series chips is a DIP, but for various reasons, including compatibility with existing boards and plugs, the same device may be available in a 16-pin package.

1.4142
Approximately the square root of two. At around 5pm on Sunday, Jan. 4, 1998 (a date, incidentally, that is for me the 14th anniversary of a major automobile accident), this glossary had 14142 entries, or approximately the square root of 200 million entries (squared; see 43 beans entry). I then added this entry, destroying the effect. Is this a performative statement or a deconstructive one?

A more accurate estimate (of the square root of two) is 1.4142135623730950488016887242097 .

14.25
Plan 14.25 ordered the systematic doping of East German athletes during the 1970's and 1980's. Hey, sure it was illegal, but all that glitters is not gold. The people who complain about this are just poor losers, and suckers who trained hard but represented nations that didn't take the games seriously enough to give their athletes the very best chemical advantages. You know, East Germany's athletes made sacrifices too; after all, heavy doping is not without its side effects, and standing up to the (justified) suspicions and contempt of the international opponents you have cheated requires great courage and brazeness.

Anyway, all that stuff is history. Many of the star coaches and pharmacologists of the old East German sports machine found a congenial new home in the People's Republic of China (PRC), which still upholds the values that were contained by the much-lamented Berlin Wall. And there is no question that the sudden great success of PRC women's swimming team has nothing to do with that old East German magic. The proof: East German chemists provided many very sophisticated, hard-to-trace drugs, but the only thing that desultory testing by a reluctant IOC has been able to find in Chinese swimmers has been artificial testosterone. (Hmm. See also the Tootsie entry.)

Janet Evans, a US swimmer who won three golds in 1988, and a silver and gold in 1992, thought after the wall fell that there would be no more organized drug use. Interviewed before the 1996 Olympics (NYT, Thurs. 18 July 1996, p. B9, byline George Vecsey in Atlanta) she said she favors proposals that any nation with four positive tests in swimming in one Games be banned from the next Games.

142857
The sequence of repeating digits in the decimal expansions of 6/7, 5/7, 4/7, 3/7, 2/7, and 1/7. To obtain the corresponding sequence for 0/7, multiply each digit by zero.

144
The square of 12. The number of square inches in a square foot, or square lines in a square inch, or square troy ounces in a square troy pound. I'm not claiming this is useful information. Here's some more information: according to both the Regionary Catalogue appendices (written in the fourth century) and to Pomponius Leto, Rome had latrinae publicae CXLIIII. That's gross!

153
Old number in the UK for international directory assistance (DA). See 192.

16 inches
The center-to-center distance between studs. I doubt that this particular measurement is the origin of the biological sense of the word stud.

16mo
Sextodecimo [<L. (ablative) a sixteenth], `sixteenmo.' Size of paper (and books made thereof) obtained by dividing a standard printer sheet into sixteen parts (i.e., halved four times) to give 6 by 4½ inch leaves. More loosely, pages 6-7 inches high.

16 Segment Display
For alphanumeric display (Cf. 7 Segment Display.) All segments lit displays
           -- --
          |\ | /|
          | \|/ |
           -- --
          | /|\ |
          |/ | \|
           -- --

1.6021892(46) × 10-19
The quantum of charge, in coulombs.

1.61803398874989484820458683436564
Approximate value of the golden mean.

1666
Annus Mirabilis (q.v.) in England.

17
Perhaps the fact that 17 is generally regarded as the most random number led Joan Didion to use it as a location for the opening sentence of her first novel (Run River, publ. 1963):
Lily heard the shot at seventeen minutes to one.

In the US, 17-year patents were the rule from March 1861 to June 8, 1995, but they now run on the Japanese model, 20 years from date of application.

Ellen Sue Stern's Yawn! Bedtime Reading for Insomniacs consists of selected soporific texts, many followed by Sleepercize suggestions. The sleepercizes suggested following the ``Airline Ticket Fine Print'' section include the following:

Close your eyes and count every place you've ever flown on an airplane. ... Now, recall every airport you've ever been in. Count each time, even if you've been in the Detroit airport seventeen times.

More instances of 17 are given at this webpage, proving conclusively that the number occurs.

1701, 1701A, ...
NCC-1701

1.73205080756887729352744634150587
Approximate value (adequate for most purposes) of the square root of 3. When David was in tenth grade (this is a different David), his ``math teacher pointed out that the square root of three (1.732) is the year George Washington was born (divided by 1,000, of course), and I have remembered both ever since even though I knew neither before.''

I think this kind of two-way mnemonic -- which enables one to remember both the key and the datum it is key to -- is common. David was writing in response to a posting in which I mentioned that a cantor friend reacted to my phone number ``oh, Brahms's year of birth'' (1833). I've forgotten most of the phone numbers that I've had since then, but not that one, and I also didn't know Brahms's birth year before he mentioned it as a mnemonic.

Of course, the part of the year GW was born in was designated 1731 then, and 1731/32 for many years afterwards, but it's a good mnemonic. (BTW, GW always celebrated his birthday on February 11, its date O.S. I suppose this made sense enough, and was probably common.)

1755
The year of the great Lisbon Earthquake. You probably remember it on account of Voltaire's Candide. See LE 1755.

1776
Today a heavy two-volume set on a new-book shelf caught my eye: La Iglesia en Castilla-La Mancha: La Diócesis de Toledo en la Edad Contemporánea (1776-1995) [`The Church in Castile-La Mancha: The Diocese of Toledo in the Contemporary Age (1776-1995)']. It struck me as odd that a `contemporary age' or `current era' should begin in 1776. What happened that year in Spain or within the Roman Catholic Church there? So far as I can tell from the book, not much. Part I is ``Del Antiguo al Nuevo Régim (1776-1836)'' [`From the Old to the New Regime (1776-1836)']. The pontificate of Cardinal Lorenzana as archbishop of the diocese ran from 1772 to 1800, and Pius VI was pope 1775-1799. (It almost seems an odd way to phrase it, since the fact is that when Pius VI was not pope, he wasn't Pius VI either.) There were various appointments and acts over the period. King Carlos II was succeeded by Carlos IV in 1788, and the French were revolting from 1789 on, with very important consequences for Spain. Of course, in 1776 some British colonies in North America were rebelling and proclaimed a precedent-setting Declaration of Independence, widely translated and published in Europe, but from the standpoint of Roman Catholic Church history in Spain, 1776 is a strange year to anchor a periodization.

18Meg
Deionized water. [18 Megaohm-cm is the resistivity of completely deionized, pH 7 water.]

1845
A big year for rules. The US Congress set the date of election day, and an official set of US baseball rules was adopted. The rules contained the innovation that runners would be put out by tagging rather than by being hit with a thrown ball. This made it possible to have a harder ball (which could be hit harder, so the field became larger). This change in the rules led to a surge in the popularity of baseball.

186,000
The number of miles light travels in a second, and the number of base pairs in the gene that codes for AHG. The former is the fastest speed in the universe (c), and the latter is one of the largest genes in the human genome. Both numbers are approximate, but in different ways. It's such a big number, I would guess that there aren't many numbers much larger, unless you count the numbers 186,001 through 20,000,000.

The speed of light is known exactly by definition (see c); in the appropriate units mentioned above, its value is

                  __________________________________________
        186282.397051220870118507913783504334685437047641772

1870
In that year, the first Vatican Council discovered that the Pope is infallible in certain matters. Some Roman Catholics who disagreed then seceded and formed the ``Old Catholic Church.'' Hence, the Old Catholic Church was a new Catholic Church.

None of this had a great effect on the outcome of the Franco-Prussian war.

19F
Fluorine isotope with A=19. Popular with NMRtians.

1903
The year after 1902. Also the year that the Wright Brothers achieved controlled flight in a heavier-than-air vehicle.

1917
This entry is your 1917 information headquarters. From here, you can link to all of the 1917-related events in this Glossary. Currently, we offer entries to do with tourism (AEF), (the) Buffalo Bill(s), garment-worker digs, the Wobblies (IWW), O.E.T.A., some random Hupp information, music of the Sphere, royal housing in the UK and USSR, the US Air Force, and nothing to do with power-delay product (PDP).

1918
This entry is your 1918 information headquarters. From here, you could link to all of the 1918-related entries, if we had any.

Well, since this entry was first written, we've added entries that do mention 1918, so it is no longer the case that you could link to all of the 1918-related entries, if we had any.

1919
This entry is your 1919 information terminal. From all entries that mention 1919, you can reach this entry. Isn't that special?

1919
The year that twelve-year-old George Bailey saved his kid brother from drowning after eight-year-old Harry fell through thin ice (they were sledding on shovels). As a result, George caught a bad cold and ended up losing the hearing in his left ear. If he'd lost the hearing in both ears, it would have made a very different movie.

Notice that this puts the bank panic in 1933 [George marries Mary Hatch after she gets back from college; she was in Harry's year]. The snow that day is not dramatic license: Frank Capra checked weather reports for the New York City area on the day of the bank crash.

192
For a long time in the UK, 192 was the telephone number for in-country telephone directory inquiries (okay, ``enquiries'' -- we can do it that way too). As of 2002, BT had GBP 300 million revenues from directory enquiries. In 2003, this number was phased out (as was 153 for international directory enquiries) in favor of a number of competing alternative services, each with a six-digit number beginning in 118. As of September 2003, there are at least fifteen 118 numbers, including (or perhaps in addition to; I'm not sure) a small number of 118 services for international directory enquiries.

Cf. 411.

1924
The year that the National Origins Act drastically curtailed immigration to the US.

193E
24 frames per superframe. ``Extended Superframe format (ESF).''

193S
12 frames per superframe. ``Superframe format.''

194K
Atmospheric-pressure sublimation temperature of dry ice.

For my master's thesis, I packed my sample in dry ice to cool it below its Curie temperature. The sample modulated transmission between a tuned pair of microwave cavities. When I opened the system up, I discovered that instead of measuring the ferromagnetic antiresonance (FMAR) of my sample, I had measured transmission through water ice. I became a theorist.

Evacuate your waveguides if you're going to cool them even a little below 0 °C.

1963
John Profumo resigned that year on June 5, brought down by a sex scandal. The following November 4, the Beatles appeared on the Royal Variety Show.

Sexual intercourse began
In nineteen sixty-three
(Which was rather late for me)
Between the end of the Chatterley ban
And the Beatles' first LP.

-- Philip Larkin, ``Annus Mirabilis''

For more than I propose to write about 1963, see what Derek Brown has to say about it in the Guardian. Brown thinks Larkin was off a bit on the year. I agree, see the SBF Buffalo Bills entry. (Stay with it: we're talkin' sex!)

1964
On December 21, capital punishment was abolished in Britain.

1965
Capital gains tax was introduced in Britain.

1970
The year of rock-music guarantees.

1973
The value of ħc in units of eV-Å. Craig tells students that the mnemonic to remember this is ``the year of the Senate Watergate hearings.'' They give him a look back that says ``Old man, you and your ancient history bore me. Why should I memorize dreary dam-project legislation just so I can recall four digits of a number my calculator can give me?'' If you don't get it, see this entry.

I have a confession to make. When I was in high school (and not watching the Watergate hearings), my classmates used to face off in pi races: competitive rattling-off of the first 100 digits in the decimal expansion of pi. The confession is, I never participated. To this day I can only remember about ten, although the next eight after that look familiar.

[Completely gratuitous Elvis image]

1977
The year Elvis went into occlusion. We await his return as the eleventh Imam.

[column] Elvis has been reissued in Latin on CD's.

I only recently realized that there's a section of Meijer's general market that's permanently dedicated to velvet portraits and other Elvis necessities.

Update, late July 2002:
An Elvis remix is climbing to the top of the charts around the world. His second coming! In a deep voice, the Hidden One calls for ``a little less conversation and a little more action.'' The end times are upon us! ``Grab your coat.'' Believers -- prepare for rapture! The King has come!

1984
Pardon our dust. This entry is under construction. That means that information is missing from the glossary. This is good, because
IGNORANCE IS STRENGTH.

The table below lists glossary entries that mention 1984 in some connection or other. The asterisks indicate content related to...

Orwell    Election   Olympics  Macintosh   Entry
  _          *          _        _         Alan Keyes
             *                             DLC
  *                                        DoD
  *          *                   *         downtown Holland
	     *                             ECT
	     *                             GI
  *                              *         Joy's Law
  *                                        Minitrue
             *                             SARV
  *                                        TRU
                                 *         USOC

What a mess!

1991
The year of blue triumphs. 3M announced a blue-light laser, and Suntory announced the development by genetic engineering techniques of a blue rose. The Stammtisch acknowledges Prof. T. Yao, of Tohoku Univ., Japan, for this colorful observation.

1994
That was the year in sports. For some details see the following entries:

1998
The year that broadcast deregulation is supposed to occur in Europe. They might meet this deadline, unlike 1996, which turned into 2000.

1999
The capstone year for European monetary integration: on January 1, individual national currencies of those member countries that chose to join, and which met inflation-rate and budget deficit limits (countries whose economies met the ``convergence criteria'') had their mutual exchange rates fixed. Prices now appear in euros, euri, ...., and the euro is the unit of account in business-to-business transactions. As of January 2002, people can actually buy stuff using euro currency. After February, the old national specie of the euro zone countries (now called Euroland) was no longer legal tender.

It's been a great success, all according to plan, except that the euro has been on a steady slide against the dollar. Oh yeah, oil prices and a couple of other things are set in US dollars, so the oil-price wedgie of 2000 had a little extra oomph in Europe. Given the current accounts imbalance, and the 25% slide of the euro against the dollar in its first 20 months of existence, it's almost bizarre to see European companies buying up American. Many reasons have been adduced -- low debt of European companies, strong US economy, lack of a single government that will credibly support the value of the euro, etc. Financial markets are notoriously hard to predict, but they are easy to explain, nonfalsifiably, in hindsight.

The real reason for the fall of the euro is obvious, though few are willing to admit it: ``euro'' is a bad name. The error was compounded by the choice of EUR as its three-letter code. The only thing that prevented it from sinking even faster was the contemporaneous US introduction of supposedly harder-to-counterfeit paper money that is profoundly ugly.

On September 28, 2000, Danes voted 53.1% to 46.9% against adoption of the euro. Britain and Sweden remain out, Greece (which initially failed to meet the convergence criteria) joined on January 1, 2001. The Danish Krone continues to be pegged to the euro. It used to be pegged to the Deutschmark, and for a while it still was indirectly, since the Deutschmark was fixed against the euro (1 EUR = 1.95583 DEM).

An interesting thing about the euro is that it has a ratchet (or is that ``racket''?) mechanism, like the Eagles' ``Hotel California'' --

I tried to find a passage back to the place I was before.
...
but you can never leave...

Cf. ECU.

In 2002, the Vatican reassessed its real estate. St. Peter's Basilica and the other properties had been on the books at a nominal value of one lira. A value is needed in order to compute a total value of Vatican assets for the annual budget report (Consolidated Financial Statement). The nominal value skyrocketed -- to one euro (a 193,527% increase). They don't explain why they use such a small nominal value, but the reasons are obvious.

    There are two main reasons:
  1. If the Italian government should ever insist they pay property taxes, they'd be paying on a rather low assessed base. Of course, before that could happen, Italy would have to annex the territory, in violation of the Donatio of Constantine and later international agreements. In fact, this already happened once in the past. The international community was outraged, of course, especially other countries that are small like Vatican City is. Fiji, a number of Caribbean nations that had earlier rescued Grenada, and Eritrea all spontaneously coalesced to form what came to be known as a ``coalition of the grudgingly eager.'' They were also able to persuade the US to provide some assistance (logistics, C4I, and half a million heavily armed advisors). The campaign (Operation Holy Smoke) began with an attack by missiles described as ``scary smart.'' As a Pentagon spokesman explained, the goal was to create ``shock and epiphany.'' The elite and once-imposing Swiss Guard was destroyed in the first 6 seconds of the war, leaving behind nothing but colorful scraps of cloth and a couple of brass spearpoints. Very soon, it was ``Mission Accomplished,'' and nothing left to do but the passivation. Uh-ohhh... I think I may have this war confused with another one. The liberation of the Vatican already happened in the future, not in the past.
  2. Another reason for the low valuations is the need to shield assets in case of a ruinous suit. So far, it's been dioceses that have been flirting with bankruptcy, but you never know. The Catholic Church has operations in over 200 countries. Any one of those countries -- the US, say -- might have surprising attitudes about liability and an expansive notion of sovereignty. Or what if the International Court of Justice decides that the Vatican owes Crusaders' descendants unpaid veterans benefits with as much as 900 years' accumulated interest? To say nothing of liability for all that collateral damage, with triple indemnity under RICO, etc. The Church needs to protect its assets and subito, so it doesn't, um, go under the way the Hara Krishni did. Sorry -- I meant Hare Krishna. What the Church has to do is form an asset management company -- based in Delaware, say. (I'm sure the Cayman Islands offer competitive alternatives, if US taxes become an issue.)
    A small group of trusted cardinals could buy up all the assets for, say, 300 bucks, and incorporate as VatHoldings, Inc. or something. You can incorporate in Delaware with as few as three company officers, and nobody even has to show up in the state. New incorporation options like LLC and LLLP offer increased liability protection, and Delaware is very aggressive about maintaining jurisdiction under its own separate business-court system. (Sure, cash assets can't be directly underassessed, but VatHoldings would have to purchase the debts as well. They have to take a charge for the care of all those aging brothers and sisters, you know. Cf. TUPE. The Vatican might happily pay to have a management company take personnel off its hands.)

1999
Short title for a song by an artist who said he planned to retire it after playing it on New Year's Eve, Dec. 31, 1999. If you don't suspect some confusion here, see this entry.

2
Rebus for to, as in the search engine a2z, the business buzz-``words'' B2B and B2C, and various conversion codes. Occasionally a rebus for too too.

Among the spelling errors for number homonyms, the most common one that I have observed is the writing of to when too is meant.

2
The even prime.

2-AFC
2-Alternative Forced Choice. A kind of survey question, specifically targeted against fence-sitters. Normally what it means is that the person surveyed must answer yes or no (or like or dislike, or whatever) or else discontinue taking the survey. It's intended to draw out opinions from those who (maybe only think they) ``lean'' one way or another. It is more effective (I won't say more accurate) if the survey is paying for participation or if the person conducting the test has some other means of persuasion such as a handgun.

2B, 2b
Baseball term:
  1. Second Base[man].
  2. Hit for a double.

2 bits
Twenty-five cents of a dollar (25¢). The expression dates back to Colonial America, when many denominations of currency were in circulation, particularly including Spanish Milled Dollars, or doubloons. These coins were indented into eight sectors, and could be broken into bits or `pieces of eight.' Two bits were a quarter dollar. Four bits of a different sort are a nybble, or half a byte. Because pure gold is an unusually soft metal, one traditional way to check whether a coin wasn't fake was to bite it and see if that left a mark. I imagine that really clever counterfeiters would mint their fakes with a bunch of cast-in indentations.

In Spanish, one of the names of coins of this denomination was dolar, after the Dutch daler, which translated German Thaler. That was short for Joachimsthaler, locative form of Joachimsthal, or `Joachim Valley,' the name of a valley in Bohemia, and subsequently a town in that valley, where a similar coin was first minted. (See Groschen.) That town was destroyed near the end of the 30 Years' War, I think. Rebuilt or not, it is now Jáchymov (in the Czech Republic), a center of uranium mining. There's also a town called Joachimsthal about 30 miles northeast of Berlin. That was named after a man named Joachim. (Incidentally, the German word Thal, now written Tal, is cognate with the English dale.)

The term milled generally means machined or worked in some way -- passed through a mill. (A mill was originally only a grinder for grain. The name was applied to a succession of larger and more sophisticated grinders; as the first piece of fixed, heavy machinery that typically ran on something other than human muscle power, it gave its name to other machines.) Milling has a couple of specialized senses in the case of money. A milled coin has a raised edge, possibly with radial grooves, and milling refers both to the making of the raised edge and to the marking of that raised edge.

In ``milled dollar'' it's hard to hear the final consonant in the first word distinctly from the initial consonant of the second. Hence, ``Spanish Mill Dollar'' is now a more common spelling. A similar thing has happened with the cold treat originally called ``iced cream.'' Not very different is the evolution of ``you've got another think coming'' into ``you've got another thing coming,'' helped along by Judas Priest's ``You've Got Another Thing Coming.'' (Some possible insight into ng vs. nk at this ng entry.)

By controlling Mexico and South America, Imperial Spain had access to the richest supplies of gold of the day. It was literally Spain's golden age. Wasted riches, like the oil wealth of today's Venezuela and Brunei. In those days, private banks in the US would issue notes whose value was guaranteed by the bank's promise to redeem the paper for real money -- specie. The coin of choice in the US was the dollar coin into which Spain minted its gold. Here are some convenient examples, where the ``milled'' spelling can be read clearly.

It was very tempting for banks to issue more paper money than they had specie to back. Indeed, it was more than tempting. A bank makes its money by lending on interest. If you lend money in paper that isn't backed by specie, you increase the money supply and economic activity, and your interest income. So long as you don't issue too many bad loans, and so long as not too many people redeem their bank notes all at once, you can have a lot more money in circulation than you have specie in reserve, and make a bigger profit. The trouble is, your bank notes aren't really backed by specie, they're backed by your debtors' promises to repay. Every so often, people handling the notes of some bank start thinking that there seem to be a lot of the notes around, and begin to wonder if the bank is ``diluting'' the value. Soon there's a run on the bank as people hurriedly redeem their paper before the coin that supposedly backs it runs out. This would cause little economic crashes on a regular basis. I think the last big one of this sort was in 1893.

Eventually, though unsteadily, the US government put private banks out of the business of printing money (though some US banks do print money circulated by some other countries). (For a bit on the parallel process in France, see the BULLION entry.) Federalizing bank notes didn't really solve the problem, though. The whole situation was repeated with specie replaced by government paper and coin, and with bank notes replaced by bank accounts. A run on a bank then simply meant that lots of people suddenly wanted to liquidate their accounts. As George Bailey, played by Jimmy Stewart, explained to panicked customers in ``It's A Wonderful Life,'' the Building & Loan couldn't redeem accounts because the accountholders' money was at work on loan. In the Great Depression, that situation depicted in the movie played out less successfully in the real life of many towns. That's why the FDIC was created. The FDIC does require banks to have some money on reserve, but basically they avoid runs by credibly promising to make accounts (up to $100,000) good. Fundamentally, it works because people believe it will work. After the depression, a few states, like Ohio and Maryland, did not require banks they chartered to be federally insured. (I think both of these had state insurance systems.) Thing were cool all the way through to the 1980's when they experienced bank runs and quickly changed their laws.

The US government -- enh, the Federal Reserve -- does not promise to redeem your money with gold. Instead, the notes are backed, ultimately, ``by the full faith and credit of the US government.'' I think this means that they'll redeem your worn-out dollars for crisp new ones. Sounds kinda wishy-washy, but it seems to work. To be fair, it's a little more magical than that. A dollar is worth a dollar because Congress says it is legal tender: if a debt is denominated in dollars, then federal reserve bank notes have to be accepted in payment of it. It's really beautiful when you think of -- an entire economy held together by an abstract set of mutual obligations to honor a money concept only symbolically and rather incompletely backed by anything of ``value.'' Of course, the value of the dollar in terms of anything other than dollars is variable.

The Spanish Milled Dollar is not currently tracked at this currency conversion resource. (Notice how Andorra uses both French and Spanish money -- especially now that it's the same money.)

2B1Q
Two Binary One Quaternary (modulation).

2D
Two Dimensions or Two-Dimensional.

If you already understand about dimensions, please avert your eyes. The following is for those who bailed out of the math courses before college, and are mystified by the frequent application of terms like ``two-dimensional'' to a variety of radically different things, like the water's surface or a soap bubble, or personalities, or the elastic properties of isotropic, homogeneous materials.

Briefly, two-dimensional things are things described with two independent numbers.

Dimensionality is a crude first indication of how a phenomenon or object will be described quantitatively. A two-dimensional object is an object which, for the purposes of a particular description, needs two independently varying numbers. For example, no wait, I have to catch my breath.

Alright, let's consider some examples. A large class of simple examples is flat things.

2DEG
Two-Dimensional Electron Gas. [Pron. ``two-degg'' by some, ``two dee ee gee'' by others.] Electrons free to move easily or in a smooth potential along two directions, but confined within one or a few quantum state(s) of the transverse potential. The two most prominent examples are the electrons confined in a MOSFET inversion layer, and in a quantum well.

2DEGFET
2DEG FET. Much less common name than MODFET or HEMT, but not completely unknown [ Ftnt. 22 ].

2DHG
Two-Dimensional Hole Gas. Just like a 2DEG.

2DPAGE
Two-Dimensional PolyAcrylamide Gel Electrophoresis.

2/e
Second Edition.

2GL
Second-Generation Language. Assembler, or Assembly language. The terminology did not come into use until there were three generations. See 3GL entry for more explanation.

2-inch pipe
Pipe with an inner diameter (i.d.) of about 2-1/8 inches, and an outer diameter (o.d.) (for galvanized steel pipe) of about 2-5/8 in. (The links aren't for anything useful; they're just to prove that the abbreviations have been included in the glossary.) It's ``nominal two-inch pipe.'' Two inches is the nominal pipe size (NPS).

2L
Second-year Law School student. Cf. L2.

2LD
Second-Level Domain. Like plexoft in <plexoft.com>.

2N
Common designation for transistors.

2NF
Second Normal Form.

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2-ouzo question
A question best answered only in a state of clearly compromised sobriety. Jargon at the American School in Athens. Refers to emotionally charged questions about the historicity of national, religious or ethnic myths, that people hope archaeologists will answer (in some particular way). (See classics list archives.)

2Q
Second Quarter. Of the year -- fiscal, academic, calendar, etc.

2 secs remaining
Stalled.

2SH
Two-Source Hypothesis. The hypothesis that the Gospel of Matthew (GMatthew) and GLuke were written using as sources GMark (possibly an early version of GMark differing slightly from what has come down to us) and another document that has not survived independently, called Q. Comparison of the synoptic gospels (and with GThomas) is the main method used to reconstruct Q, since there is no evidence for Q outside the similarities of GMatthew and GLuke that the 2SH was proposed to explain. Also ``2ST.''

Alternative theories include various versions of the 3ST and the FgH (follow the 3ST link).

The 2SH was developed in the nineteenth century by Protestant Biblical scholars in Germany such as H.J. Holtzmann and Christian Hermann Weisse (1801-1866). In German the hypothesis is called the Zweiquellentheorie.

2ST
Two-Source { Thesis | Theory }. The two-source hypothesis, q.v.

2-stroke
Two-stroke engines? You wouldn't think to look there, but we have some discussion of them under OHV.

2X
Double eXtra-large: size XXL. Not size XXS, because there is no XXS. There's no single extra-small available either, but double extra-small would include negative values for certain anatomical dimensions, which I understand is biologically unlikely. Even plain old small is getting hard to find these days. Everybody is supersized; I wonder why.

Hey! 2X costs a dollar more! Discrimination! Sizism! (Prejudice against people of size.)

2X10, 2×10
A length of cut wood of standard size, a bit under 2''×10'' in cross section. Common for flooring in wood-frame houses. Cf. 2X4.

2X4, 2×4
A length of cut wood of standard size, a bit under 2''×4'' in cross section. Traditionally, the size has been about 1/8'' narrower in each dimension, ostensibly because of the wood eaten by the saw (``kerf''). ``4X2'' in British and Australian.

North American wood-frame houses typically have walls with vertical two-by-four studs spaced 16 inches apart. No matter what the insulating material is, it's a good guess there's a little under four inches of it, not counting the sheetrock.

2X6, 2×6
A length of cut wood of standard size, a bit under 2''×6'' in cross section. Common for rafters in wood-frame houses. Cf. 2X4.

2X8, 2×8
A length of cut wood of standard size, a bit under 2''×8'' in cross section. Used for flooring in wood-frame houses. Cf. 2X4.

200
Successful HTTP response codes (q.v.).

200
The number of body parts recognized by Procter and Gamble. The Lever Brothers seem to have found a mechanical advantage: they recognized 2000. See also the 99.44 entry.

2000
A heavily hyped year that was going to confuse codes which recognize and order years by only the last two digits. A dud. I'm leaving the rest of this entry the way it was before 2000, as a sort of historical artifact.

Here's the usual logorrheic description from IBM.

My mind is boggling up pretty badly: I just noticed that there's yet another non-joke site that is offering to solve businesses' looming problems with the year 2000. I tremble to think what AltaVista might reveal. It's called by various names, including ``millennium dating problem'' and ``Y2K"

2000
The number of body parts recognized by the Lever Brothers. Some years ago they advertised that their Lever 2000 soap cleaned all of them. They're not very forthcoming about the answer, but the key phrase that seems to appear verbatim in all of the responses is
Obviously, it was our intention that using the number "2000" in connection with body parts would help to reinforce our product name and the fact that Lever 2000 is milder to the skin than any other antibacterial or deodorant soap on the market.
Extrapolating from the two exchanges I found reported on the web (the two links above) it seems that if you write on behalf of yourself and your girlfriend you get two coupons instead of one.

Best guess at how you could come up with 2000 if you tried seems to be to count well over a thousand of the hairs. If you want a more manageable number, try Procter and Gamble for 200.

-20/25 rule
The assumption or rule of thumb that 20% under or 25% over a given dosage is not therapeutically significant. Note how a factorial analysis is implicit in the form of this rule: -20% is decrease by a factor 4/5, while +25% is increase by the inverse factor of 5/4. This is a very precise form of imprecision.

200 to 800
SAT exams are scored on a scale that is described as ranging from 200 to 800, and many wonder why.

There's been some tinkering with the scoring algorithm (see SAT entry for an example) but here's a clue to why one might choose an algorithm with a nonzero minimum: If the score on a multiple-choice question is x for the right answer and 0 for any wrong answer (sometimes these terms should be in quotes), then simple guessing will lead to a higher score, on average, than leaving the answer sheet blank. A better scheme, for questions with n possible answers, awards n for a right answer, scores 1 for a blank, and 0 for a wrong answer. The average score obtained by guessing randomly is 1 (a score of n, a fraction 1/n of the time), the same as for leaving the question blank. (The SAT's use this kind of scoring rule.) The range of scores on 200 questions with n = 4 possible answers is 0 to 800, but anyone turning in a completely blank answer sheet gets a 200, as does the average person who guesses randomly on those questions answered. (Granted, this is an `average' person only in a somewhat restricted statistical sense.)

The standard deviation around this 200, for a person guessing randomly on all questions, is about 24.5 . However, if you can rule out some of the right answers, you can improve your chances of getting a perfect zero.

2003
Our previous year entries, such as 1917, have been entered after allowing the dust of history to settle. This gave us some useful perspective. The downside, however, was that if the world ended, we would not have had an entry for an important year. So far, we've been lucky, but we can't count on our good luck to hold up forever. In fact, our good run has only increased our peril: If the world had gone kablooey (also spelled ``cablooey'') at any time between 1995 and 2002, then there'd have been no chance of the year 2003 ending without an entry, since there wouldn't have been a year 2003. Since the world did not end during those years, however, that possibility -- that safety valve, so to speak -- has been eliminated. Consequently, the danger that the world comes to an end in the current era (from 2003 on) is increased. It's a global version of the syllogism that
  1. Today is the first day of the rest of your life.
  2. One day you will die.
  3. Therefore, you could die tomorrow.

In view of the increased danger, I decided to maintain a real-time 2003 entry, like a diary or embedded blog. Of course, I only increment the entry if something noteworthy happens.

20/10
Excellent visual acuity. Dennis had 20/10 vision when he entered college. But after all that studying, who knows what it is now. Cf. 20/20.

20/20
``Normal'' visual acuity. This notation is traditionally used to describe static visual acuity as measured using Snellen eye charts. Since the number 20 represents a distance of 20 feet, you can probably guess that it's traditional only in places that use that length unit. The notation still seems to be widespread in places like the US and, uh, Western Samoa. For a detailed description of this wonderful system, and of the brilliant adaptation that has made it possible to continue using it in the (temporary, of course) metric era, see if you can read the Snellen entry.

20/40
Not very good visual acuity, compared to 20/20 (which see, if you can).

IS THIS BETTER?

210.141
That's French for 210,141. It's the number of possible dramatic situations, according to Étienne Souriau, a well-known professor of aesthetics at the Sorbonne who published many books on philosophy and aesthetics. It was the subject of his book Les Deux Cent Mille Situations Dramatiques, published by Ernest Flammarion in 1950 as part of the series Bibliothèque d'esthétique. The precise number can be factored into 33 × 43 × 181, but that's not quite how it was arrived at. Instead, its combinatorics is founded on the 36 dramatic situations of Georges Polti, although it doesn't use his subcategorizations of those 36. You'll probably need frequent reminding, so let me start immediately by assuring you that at the time, there were people who took this seriously. This is encouraging, because it allows us to look forward to a time when no one will utter the word deconstruction with a sneer anymore, because they'll find it too hard to keep from guffawing.

211
The high-Tc superconductor Y2BaCuO5, I think.

212
The traditional area code for Manhattan, discussed at the AG entry. This file (0-9.html) is getting too bloated anyway.

22
When Joseph Heller completed his manuscript in 1960, it was entitled Catch-18. Leon Uris had recently published a novel called Mila 18, however. Heller's editor at Knopf, Robert Gottleib, suggested changing the title to Catch-22 in order to avoid confusion. Heller liked the change, which played on the motif of repetition in the novel novel itself. For some reason the high teens and low twenties seem to have been popular in American fiction titles in those years. Philip Wylie published Opus 21 in 1949 (full title Opus 21: descriptive music for the Lower Kinsey epoch of the atomic age, a concerto for a one-man band, six arias for soap operas, fugues, anthems & barrelhouse).

There's more about Wylie at the entry for his Generation of Vipers. More information about Catch-22 can be found a few paragraphs into the TV entry.

22WSBT
See WSBT-TV, channel 22 on your TV dial if you're not too far from South Bend, Indiana.

22.4
Volume in liters of one mole of ideal gas at standard temperature and pressure.

234-5789
Just remember that number if you need some good Motown lovin'. Normally sung BEechwood 4-5789. The lyrics can be found here. More Marvelettes details here, but though they may have broken up in 1969, they were at least back together for a performance in 1986. Only one digit away from 634-5789.

2,4-DCP
DiChloroPhenol with the chlorines substituted at the ortho positions (second and fourth carbons around the ring). It's not like you have to take special pains to produce 2,4-DCP specifically if you synthesize DCP. Functional groups tend to substitute preferentially at specific carbons. Ultimately, it has to do with the quantum mechanics of the benzene bonding. Same deal with TNT: the nitro groups tend to substitute at the ortho (2,6) and para (4) positions on the toluene ring, so TNT is normally 2,4,6-TNT. You probably don't want to mess with that. Some substitutional groups on some rings do prefer the meta positions (3,5).

24mo
Size of paper (and books made thereof) obtained by dividing a standard printer sheet into twenty-four parts to give 5 by 3 7/8 inch leaves. More loosely, pages 5-6 inches high.

247
A Boeing propeller plane that competed with the immensely successful DC-3 from Douglas.

24/7
Twenty-four hours a day, seven days a week. Except that databases are not available Saturday night; food service and ATM cash are not available from around midnight early Monday morning.

2.5D
Between 2D and 3D: multiple 2D bitmaps of 3D objects.

25
Manhattan-Project shorthand for Uranium-235 (235U or U235). In general, the code combined the ``least-significant digit'' (LSD) of the atomic number Z (Z = 92) with the LSD of the atomic mass number A (A = 235 in this case). The LSD was used in each case because the relevant elements were all actinides (Z > 90) and the few stable or nearly-stable isotopes of any element all have values in a small range.

273.15
This is the absolute temperature (in degrees Kelvin) at which pure water melts under one atmosphere of pressure. As such, it is the difference in numerical value between temperatures on the Kelvin and Celsius scales.

Absolute temperature is fundamentally defined as the inverse of the partial derivative of entropy with respect to energy:

                   1   ∂S
                   - = --
                   T   ∂U
									
where S is entropy, T is absolute temperature, U is energy, and ∂, in case your browser isn't displaying it properly, is the partial-derivative curly-dee. In the derivative, all extensive variables corresponding to generalized displacements (volume V, magnetic field H, etc.) are held fixed. The definition above is really no more than the statement that TdS is an increment of heat. During the nineteenth century, as thermodynamics was being worked out, there was no obvious natural scale for entropy or temperature that could be related to mechanical units. Instead, the ideal gas law allowed an absolute temperature scale to be set, and the units of entropy were derived as erg/°C, or some other ratio of energy to degrees in some temperature scale.

Late in the nineteenth century, statistical mechanicians like J. Willard Gibbs and Ludwig Boltzmann recognized that entropy was proportional to the logarithm of the number of accessible states. Within classical mechanics, however, ``states'' form a continuum and one ``counts'' phase-space volume instead. [I am stating this in a somewhat anachronistic and ahistorical way that reflects current understanding.] If one assumes a uniform density of states per unit volume of phase space, then one can compare ratios of volumes. This allows one to compute the entropy of an ideal (monatomic) gas ab initio from a realistic classical mechanical model (small elastic massive particles), although only up to an arbitrary offset. The arbitrary offset corresponds to the unknown density of states per unit volume of phase space.

At this point, one could begin to see that the natural unit for entropy was simply units: the natural definition of entropy was just the dimensionless logarithm of a state count. In this view, temperature has natural units of energy. Given the uncertain status and limited success of statistical mechanics before the advent of quantum mechanics, and given the entrenched status of various temperature scales and corresponding derived entropy units in extensive chemical measurements, this perspective had no effect on practical measurement practice.

Quantum theory and then quantum mechanics brought discrete states into statistical mechanics, and thus eliminated the offset ambiguity in entropy: the correspondence principle is essentially that the density of quantum states in phase space is h-D, where h is Planck's constant and D is the number of independent coordinates. This principle applies in the classical or semi-classical regime of large quantum numbers, and explains the success of classical statistical mechanics at high temperature and of Wien's black-body spectrum at short wavelengths. Quantum statistical mechanics also dramatically expanded the applicability of statistical mechanics, so that today it is believed to apply to all equilibrium systems. [To be fastidiously honest, one must admit that as a practical matter most nuclear and condensed-matter systems are computationally intractable without some semi-empirical approximations that partly invalidate the computations as tests of the principles of statistical mechanics. To be fair, the fundamental consequences and beautiful theoretical clarity of statistical mechanics, as well as the computational successes it does have, are what make it a fundamentally trusted computational framework.]

This approach to the units of entropy was in fact the best possible within classical physics, because all states must be discrete states for entropy to be finite. Thus, some kind of quantum theory or quantum mechanics is necessary to compute entropy from first principles. (For an unbounded system, a continuum of states can occur in quantum mechanics, and does yield an infinite entropy at nonzero temperature. However, there is no inconsistency since an infinite system can have an infinite magnitudes of extrinsic quantites like entropy. The orthonormality and completeness relations for the continuum of quantum states indicates how they contribute to the thermodynamic potentials, and finite intrinsic quantities like specific entropy and chemical potential are finite.)

273.16
This is the absolute temperature (in Kelvin degrees) of the triple point of pure water. This occurs at lower than atmospheric pressure. If water expanded when it froze, instead of contracting, then the triple point temperature would be lower than the freezing point (273.15).

You can use the difference between 273.15 and 273.16 to learn about ice skating: Let's say that the triple-point pressure is much lower than atmospheric. Then the slope of the liquid-solid equilibrium line on the p-T plot averages to

                      1 atm - ~0 atm
                   -------------------  = -100 atm/K .
                   273.15 K - 273.16 K
Hence, if you weigh 70 kilos and your skates compress an area of 2 sq. cm, for a pressure of 35 kp/cm2 or about the same number of atmospheres, for a freezing-point depression of 0.35 °C. That's kind of iffy. Sharpen your blades or put on a heavier coat. If you ever used those children's skates, with the flat bottoms, you may have noticed that if you stood stationary, your skates could actually stick. Now you know why.

28
Manhattan-Project shorthand for Uranium-238 (238U or U238). Explanation at 25 entry.

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3
A fine investigation of the mystical significance that attached to the number three in ancient times: Gabriel Germain: La mystique des nombres dans l'époque homérique et sa préhistoire, (Presses Universitaires, 1954). This recommendation was posted to the Classics list by Owen Cramer, who wrote ``3 and its powers and multiples get a whole chapter there: the "3 x but on the 4th" trope, the 3 squared but on the 10th; the ``six days they rowed but on the seventh,'' etc. I can't now remember what he says about twelve in particular, but he dissects 550 examples of counting in Homer of which over half are these threesomes.''

For modern mythological uses of threes, see the PNAC entry.

3B, 3b
Baseball term:
  1. Third Base[man].
  2. Hit for a triple.

3-C
Three Components, as in seismography that merely records time variations in three components of displacement, rather than using an array.

3D
{Three Dimensions | Three-Dimensional}.

3DEG
Three-Dimensional Electron Gas. An ordinary, ``bulk'' electron gas. Term is useful to distinguish the ordinary sort from the 2DEG, 1DEG, and 0DEG.

3-E
Expand, Explore, and Exterminate. A class of computer games like Civilization I (and II and III).

3/e
Third Edition. Abbreviation similar to 1/e and 1/e. I don't know about you, but I think I see a pattern developing here.

3GL
Third-Generation Language. Refers to a particular SQL from Unidata, but is used more loosely to include comparable languages.

Also refers to high-level langugages (HLL's) for programming (Algol, APL, BASIC, C/C++, COBOL, FORTRAN, LISP, PASCAL, PROLOG, etc.). To this way of thinking, machine and assembly languages would be 1GL and 2GL, respectively. Languages within an application (like a database or spreadsheet) are 4GL's.

3H-PAC
3H-Para-AminoClonidine.

3i
Investors In Industry Group. New name adopted by the UK's Finance For Industry (FFI, q.v.) in July 1983.

By the 1990's, as 3i, it was Europe's largest investor in unquoted companies, with a strong bias toward manufacturing.

3L
Third-year Law School student. Cf. L3. Most US programs take three years.

3LA
THREE-Letter Acronym. TLA is a more common 3LA than 3LA, and it means the same thing. Moreover, TLA is a TLA, and 3LA isn't.

3LM
Three Levels of Metalization.

3M
A company that was originally the Minnesota Mining and Manufacturing Company (fndd. 1902).

3 magic D's
Delay, Divorce, and Death. Doesn't sound all that magic, does it? Perhaps intentionally: it's the complement of the 4 magic M's, q.v. In the formulation of Republican pollster Kellyanne Conway, women who are unmarried because of three magic D's are less likely to vote. I can well imagine that dead women are less likely to vote, except of course in Chicago (Daley country) and in Washington State (King County). Also according to this formulation, when they do vote they are more likely to vote Democratic. There, see?

According to polling data reported by columnist Ellen Goodman, in the 2004 US presidential election ``62 percent of unmarried women voters picked Kerry [the Democratic candidate] and 55 percent of married women voters chose Bush [the Republican].''

3MP
3-MethylPentane.

3NF
Third Normal Form.

3Q
Third Quarter (of the year). Fiscal, academic, calendar, whatever. Cf. Q3 entry.

3S
tri-state type of electronic logic gate output.

3SMH
The Three Stooges Meet Hercules (1962).

3ST
Three-Source { Thesis | Theory }. The theory, or hypothesis, or speculation, or wild guess, that either the Gospel of Matthew (GMatthew) or GLuke was written using as sources GMark and another document that has not survived independently, called Q. Then (on this theory) the remaining one of the synoptic gospels was written on the basis of Q and the two synoptic gospels that had already been committed to parchment (i.e., GMatthew on the basis of Q, GMark, and GLuke, or GLuke on the basis of Q, GMark, and GMatthew). With all this cribbing, it's amazing they couldn't agree more closely, but then there are John and Paul -- oh God!

It is easy to explain the great similarity in the non-Markan material in GLuke and GMatt by assuming that one author read the other's work. A major reason for positing Q at all (in the usual context of the two-source hypothesis --