This clue appeared in the NYT Crossword on Sunday, January 11, 2026 (107 Down). The answer is hidden below until you want it. Sunday puzzles are large (21 by 21) and themed, about as hard as a Wednesday or Thursday.
Answer length: 3 squares
First letter
P _ _
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About the answer
PHI as a word: (mathematics) The golden ratio; A visual illusion whereby a sequential pattern of lights produces a false sense of motion.
PHI has been an answer 8 times in the NYT Crossword and Mini since December 3, 2025.
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