Certain fraternity guy, informally Crossword Clue

If you’ve landed here for the “Certain fraternity guy, informally” clue from the October 3 2025, Washington Post mini crossword, you are in the exact right place. Our team of experts has solved today’s entire puzzle and found the precise answer for this clue.

The 3-letter answer to this puzzle is SIG. Sig is an informal term for a member of a fraternity whose name includes the Greek letter Sigma.

The clue refers to a member of a fraternity that is often abbreviated with Greek letters. 'Sig' is short for Sigma, which is a common prefix in fraternity names like Sigma Chi or Sigma Phi.

You can find all the solutions for today’s puzzle, as well as answers from previous days, on our main Washington Post Mini Crossword Answers Today (September 2026) page.

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