The letter U

UBD /U-B-D/ [abbreviation for `User Brain Damage'] An
UN*X n. Used to refer to the UNIX operating system (a trademark of
undefined external reference excl. [UNIX] A message from UNIX's
under the hood [hot-rodder talk] prep. 1. Used to introduce
undocumented feature n. See feature.
uninteresting adj. 1. Said of a problem that, although
UNIX /yoo'niks/ [In the authors' words, "A weak pun on
UNIX brain damage n. Something that has to be done to break a
UNIX conspiracy [ITS] n. According to a conspiracy theory long
UNIX weenie [ITS] n. 1. A derogatory play on `UNIX wizard',
unixism n. A piece of code or a coding technique that depends on
unleaded adj. Said of decaffeinated coffee, Diet Coke, and other
unswizzle v. See swizzle.
unwind the stack vi. 1. [techspeak] During the execution of a
unwind-protect [MIT from the name of a LISP operator] n. A task you
up adj. 1. Working, in order. "The down escalator is up."
upload /uhp'lohd/ v. 1. [techspeak] To transfer programs or
upthread adv. Earlier in the discussion (see thread), i.e.,
urchin n. See munchkin.
USENET /yoos'net/ or /yooz'net/ [from `Users' Network'] n.
user n. 1. Someone doing `real work' with the computer, using
user-friendly adj. Programmer-hostile. Generally used by hackers in
user-obsequious adj. Emphatic form of user-friendly. Connotes
USG UNIX /U-S-G yoo'niks/ n. Refers to AT&T UNIX
UTSL // [UNIX] n. On-line acronym for `Use the Source, Luke' (a
UUCPNET n. The store-and-forward network consisting of all the