Letter after sigma

This time we are looking on the crossword clue for: Letter after sigma.
it’s A 18 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: TAU.

Last seen on: –USA Today Crossword – Nov 14 2021
LA Times Crossword 28 Sep 21, Tuesday
NY Times Crossword 28 Jun 21, Monday
NY Times Crossword 27 Jun 21, Sunday
USA Today Crossword – Feb 11 2021
USA Today Crossword – Jan 9 2021
The Washington Post Crossword – May 19 2020
Thomas Joseph – King Feature Syndicate Crossword – Jan 27 2020
NY Times Crossword 5 Aug 19, Monday
USA Today Crossword – Jul 5 2019
Thomas Joseph – King Feature Syndicate Crossword – Mar 25 2019
Thomas Joseph – King Feature Syndicate Crossword – Nov 27 2018
USA Today Crossword – Nov 22 2018
The Washington Post Crossword – Nov 20 2018
LA Times Crossword 20 Nov 18, Tuesday
Thomas Joseph – King Feature Syndicate Crossword – Sep 4 2018