This clue appeared in the NYT Crossword on Friday, May 22, 2026 (6 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: 5 squares
First letter
S _ _ _ _
First and last letters
S _ _ _ A
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About the answer
SIGMA as a word: (mathematics) The symbol Σ, used to indicate summation of a set or series; (statistics) The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
SIGMA has been an answer 4 times in the NYT Crossword and Mini since November 22, 2025.
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