From The Free On-line Dictionary of Computing (19 January 2023):
PIC
1. <hardware> programmable interrupt controller.
2. A graphics language by Brian Kernighan, for textually
describing pictures with troff.
[Featured in "More Programming Pearls", Jon Bentley].
["PIC - A Language for Typesetting Graphics", B.W. Kernighan,
Soft Prac & Exp 12(1):1-21 (Jan 1982)].
["PIC - A Graphics Language for Typesetting, Revised User
Manual", Bell Labs TR 116, Dec 1984].
(1994-10-28)
3. personal intelligent communicator.
(2001-04-30)