SIGMA

Eighteenth letter of the Greek alphabet (5)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 15,890 — 2021-04-11 23:00:48
  21A: Greek letter equivalent to S (5)
• Quick crossword No 15,426 — 2019-10-15 23:00:06
  3D: Eighteenth letter of the Greek alphabet (5)