This clue appeared in the NYT Crossword on Tuesday, January 6, 2026 (6 Across). The answer is hidden below until you want it. Tuesday puzzles are a step up from Monday but still mostly straightforward.
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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