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Greek letter hidden in "epsilon"

Looking for the answer to the USA Today Crossword clue “Greek letter hidden in "epsilon"”? The solution is PSI, a 3-letter word. This clue was most recently seen in the August 8, 2026 (Saturday) USA Today Crossword. Tap any date below to open that day's complete puzzle, or search another clue from the bar above.

Answer
PSI

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