:times-or-divided-by: [by analogy with `plus-or-minus'] quant. Term occasionally used when describing the uncertainty associated with a scheduling estimate, for either humorous or brutally honest effect. For a software project, the scheduling uncertainty factor is usually at least 2.
:tinycrud: /ti:'nee-kruhd/ n. 1. A pejorative used by habitues of older game-oriented {MUD} versions for TinyMUDs and other user-extensible {MUD} variants; esp. common among users of the rather violent and competitive AberMUD and MIST systems. These people justify the slur on the basis of how (allegedly) inconsistent and lacking in genuine atmosphere the scenarios generated in user extensible MUDs can be. Other common knocks on them are that they feature little overall plot, bad game topology, little competitive interaction, etc. —- not to mention the alleged horrors of the TinyMUD code itself. This dispute is one of the MUD world's hardiest perennial {holy wars}. 2. TinyMud-oriented chat on the USENET group rec.games.mud and elsewhere, especially {newbie} questions and flamage.
:tip of the ice-cube: [IBM] n. The visible part of something small and
insignificant. Used as an ironic comment in situations where `tip
of the iceberg' might be appropriate if the subject were at all
important.
:tired iron: [IBM] n. Hardware that is perfectly functional but
far enough behind the state of the art to have been superseded by new
products, presumably with sufficient improvement in bang-per-buck that
the old stuff is starting to look a bit like a {dinosaur}.
:tits on a keyboard: n. Small bumps on certain keycaps to keep touch-typists registered (usually on the `5' of a numeric keypad, and on the `F' and `J' of a QWERTY keyboard; but the Mac, perverse as usual, has them on the `D' and `K' keys).
:TLA: /T-L-A/ [Three-Letter Acronym] n. 1. Self-describing abbreviation for a species with which computing terminology is infested. 2. Any confusing acronym. Examples include MCA, FTP, SNA, CPU, MMU, SCCS, DMU, FPU, NNTP, TLA. People who like this looser usage argue that not all TLAs have three letters, just as not all four-letter words have four letters. One also hears of `ETLA' (Extended Three-Letter Acronym, pronounced /ee tee el ay/) being used to describe four-letter acronyms. The term `SFLA' (Stupid Four-Letter Acronym) has also been reported. See also {YABA}.
The self-effacing phrase "TDM TLA" (Too Damn Many…) is often used to bemoan the plethora of TLAs in use. In 1989, a random of the journalistic persuasion asked hacker Paul Boutin "What do you think will be the biggest problem in computing in the 90s?" Paul's straight-faced response: "There are only 17,000 three-letter acronyms." (To be exact, there are 26^3 = 17,576.)
:TMRC: /tmerk'/ n. The Tech Model Railroad Club at MIT, one of the wellsprings of hacker culture. The 1959 `Dictionary of the TMRC Language' compiled by Peter Samson included several terms which became basics of the hackish vocabulary (see esp. {foo} and {frob}).
By 1962, TMRC's legendary layout was already a marvel of complexity (and has grown in the thirty years since; all the features described here are still present). The control system alone featured about 1200 relays. There were {scram switch}es located at numerous places around the room that could be thwacked if something undesirable was about to occur, such as a train going full-bore at an obstruction. Another feature of the system was a digital clock on the dispatch, board, which was itself something of a wonder in those bygone days before cheap LEDS and seven-segment displays (no model railroad can begin to approximate the scale distances between towns and stations, so model railroad timetables assume a fast clock so that it seems to take about the right amount of time for a train to complete its journey). When someone hit a scram switch the clock stopped and the display was replaced with the word `FOO'; at TMRC the scram switches are therefore called `foo switches'.
Steven Levy, in his book `Hackers' (see the Bibliography in {appendix C}), gives a stimulating account of those early years. TMRC's Power and Signals group included most of the early PDP-1 hackers and the people who later bacame the core of the MIT AI Lab staff. Thirty years later that connection is still very much alive, and this lexicon accordingly includes a number of entries from a recent revision of the TMRC Dictionary.