USG UNIX: /U-S-G Yoo'niks/ N. Refers To AT&T UNIX Commercial Versions After {Version 7}, Especially System III And System V Releases 1, 2, And 3.

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:USG UNIX: /U-S-G yoo'niks/ n. Refers to AT&T UNIX
commercial versions after {Version 7}, especially System III and
System V releases 1, 2, and 3. So called because during most of
the lifespan of those versions AT&T's support crew was called the
`UNIX Support Group'. See {BSD}, {{UNIX}}.
-- The AI Hackers Dictionary