NIL: /nil/ No. Used In Reply To A Question, Particularly One Asked Using The `-P' Convention.

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:NIL: /nil/ No. Used in reply to a question, particularly one
asked using the `-P' convention. Most hackers assume this derives
simply from LISP terminology for `false' (see also {T}), but
NIL as a negative reply was well-established among radio hams
decades before the advent of LISP. The historical connection
between early hackerdom and the ham radio world was strong enough
that this may have been an influence.
-- The AI Hackers Dictionary

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