“Summation symbol, in math” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.SIGMA is the answer to the New York Times crossword clue “Summation symbol, in math”. It was last seen in the puzzle of February 10, 2025, where it runs at 4 Down and fills 5 squares. It crosses 5 other entries in that grid — those are listed below and are the quickest way to confirm the letters you already have.