Penultimate Greek letter

This time we are looking on the crossword clue for: Penultimate Greek letter.
it’s A 24 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: PSI.

Last seen on: –USA Today Crossword – Mar 23 2020
LA Times Crossword 9 Sep 19, Monday
Universal Crossword – Sep 23 2018
The Washington Post Crossword – July 13 2018
LA Times Crossword 13 Jul 2018, Friday