The acronym GNU is recursive. What does “GNU” stand for?
Hint 1: GNU stands for “GNU’s Not Unix” (notice it refers to itself).
Hint 2: It’s a recursive acronym coined by Richard Stallman.
Solution:
GNU stands for “GNU’s Not Unix!” – a recursive acronym where the first letter stands for the acronym itself. It was chosen to indicate that GNU was Unix-like but not Unix.

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