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Crossword solution:

9 clues for "SIGMA":

  1. 'The Sweetheart of ___ Chi'
  2. Greek letter
  3. Greek 'S'
  4. . . . sweetheart of ___ Chi
  5. ___ Chi.
  6. Either 'E' in 'Greek' in the poster for 'My Big Fat Greek Wedding'
  7. Fraternity letter.
  8. Tau's predecessor
  9. ___ VII.