“Dark half of a famous duality” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.YIN is the answer to the New York Times crossword clue “Dark half of a famous duality”. It was last seen in the puzzle of March 1, 2026, where it runs at 69 Down and fills 3 squares. It crosses 3 other entries in that grid — those are listed below and are the quickest way to confirm the letters you already have.