This clue appeared in the NYT Crossword on Friday, January 9, 2026 (2 Down). The answer is hidden below until you want it. Friday puzzles are themeless and hard, with clues that are vague on purpose.
Answer length: 4 squares
First letter
U _ _ _
First and last letters
U _ _ X
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About the answer
UNIX as a word: (computing) An operating system largely compatible with Unix that qualifies for use of the UNIX trademark, currently owned by The Open Group; (computing) An operating system that shares the original source code by Dennis Ritchie and Ken Thompson.
UNIX has been an answer 3 times in the NYT Crossword and Mini since January 9, 2026.
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