Next-to-last Greek letter

This time we are looking on the crossword clue for: Next-to-last Greek letter.
it’s A 25 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: PSI.

Last seen on: –USA Today Crossword – Sep 21 2020
Wall Street Journal Crossword – October 09 2019 – Getting the Last Laugh
Wall Street Journal Crossword – Mar 12 2019 – Bruisers
USA Today Crossword – July 25 2018 Wednesday Crossword Answers