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T: /T/

  1. [from LISP terminology for ‘true’] Yes. Used in reply to a question (particularly one asked using The -P convention). In LISP, the constant T means ‘true’, among other things. Some Lisp hackers use ‘T’ and ‘NIL’ instead of ‘Yes’ and ‘No’ almost reflexively. This sometimes causes misunderstandings. When a waiter or flight attendant asks whether a hacker wants coffee, he may absently respond ‘T’, meaning that he wants coffee; but of course he will be brought a cup of tea instead. Fortunately, most hackers (particularly those who frequent Chinese restaurants) like tea at least as well as coffee — so it is not that big a problem.

  2. See time T (also since time T equals minus infinity).

  3. [techspeak] In transaction-processing circles, an abbreviation for the noun ‘transaction’.

  4. [Purdue] Alternate spelling of tee.

  5. A dialect of LISP developed at Yale. (There is an intended allusion to NIL, “New Implementation of Lisp”, another dialect of Lisp developed for the VAX)

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