Trident-shaped Greek letter

This time we are looking on the crossword clue for: Trident-shaped Greek letter.
it’s A 27 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: PSI.

Last seen on: –Universal Crossword – Feb 16 2020
LA Times Crossword 12 Nov 19, Tuesday
USA Today Crossword – Mar 24 2019
USA Today Crossword – Feb 8 2019