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A unit of fiber fineness assessed by the weight in grams of 1000 meters of yarn; the lower the number the finer the yarn.


(graphic arts)
A text processing system available for many types of computers and used in particular for high-quality typesetting of documents with mathematical content.



a unit of linear density (g/km) used to describe the fineness of fibers and yarns. The Tex has been used in the USSR since 1956.


/tekh/ An extremely powerful macro-based text formatter written by Donald Knuth, very popular in academia, especially in the computer-science community (it is good enough to have displaced Unix troff, the other favoured formatter, even at many Unix installations).

The first version of TeX was written in the programming language SAIL, to run on a PDP-10 under Stanford's WAITS operating system.

Knuth began TeX because he had become annoyed at the declining quality of the typesetting in volumes I-III of his monumental "Art of Computer Programming" (see Knuth, also bible). In a manifestation of the typical hackish urge to solve the problem at hand once and for all, he began to design his own typesetting language. He thought he would finish it on his sabbatical in 1978; he was wrong by only about 8 years. The language was finally frozen around 1985, but volume IV of "The Art of Computer Programming" has yet to appear as of mid-1997. (However, the third edition of volumes I and II have come out). The impact and influence of TeX's design has been such that nobody minds this very much. Many grand hackish projects have started as a bit of toolsmithing on the way to something else; Knuth's diversion was simply on a grander scale than most.

Guy Steele happened to be at Stanford during the summer of 1978, when Knuth was developing his first version of TeX. When he returned to MIT that fall, he rewrote TeX's I/O to run under ITS.

TeX has also been a noteworthy example of free, shared, but high-quality software. Knuth offers monetary awards to people who find and report a bug in it: for each bug the award is doubled. (This has not made Knuth poor, however, as there have been very few bugs and in any case a cheque proving that the owner found a bug in TeX is rarely cashed). Though well-written, TeX is so large (and so full of cutting edge technique) that it is said to have unearthed at least one bug in every Pascal system it has been compiled with.

TeX fans insist on the correct (guttural) pronunciation, and the correct spelling (all caps, squished together, with the E depressed below the baseline; the mixed-case "TeX" is considered an acceptable kluge on ASCII-only devices). Fans like to proliferate names from the word "TeX" - such as TeXnician (TeX user), TeXhacker (TeX programmer), TeXmaster (competent TeX programmer), TeXhax, and TeXnique.

Several document processing systems are based on TeX, notably LaTeX Lamport TeX - incorporates document styles for books, letters, slides, etc., jadeTeX uses TeX as a backend for printing from James' DSSSL Engine, and Texinfo, the GNU document processing system. Numerous extensions to TeX exist, among them BibTeX for bibliographies (distributed with LaTeX), PDFTeX modifies TeX to produce PDF and Omega extends TeX to use the Unicode character set.

For some reason, TeX uses its own variant of the point, the TeX point.

See also Comprehensive TeX Archive Network.


E-mail: <tug@tug.org> (TeX User's group, Oregon, USA).


(Greek letters tai epsion chi) A typesetting language developed by Stanford professor Donald Knuth that is noted for its ability to describe elaborate scientific formulas. Pronounced "tek," TeX is widely used for mathematical book publishing throughout the world.

Knuth created the first prototype of TeX in 1978 to avoid having to continue using the Unix troff program to typeset his book series, "The Art of Computer Programming." It took eight years of writing and revising to complete the language. Available for DOS, Windows, Mac, Unix, Linux and other platforms, visit the TeX User Group at www.tug.org for more information. See LaTeX.
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