Clue: Platonic letter?

Answer: ETA

Length: 3

---

Similar Clues:

• Platonic letters (RHOS with 4 letters)
• Platonic letter (ETA with 3 letters)
• Letter encls. (SASES with 5 letters)
• Start of a Christmas letter from Rudolph? (DEERSANTA with 9 letters)
• Threaded hole, to a letter writer? (IOFTHENEEDLE with 12 letters)
• Letter head (POSTMASTER with 10 letters)
• Letter lines (SERIFS with 6 letters)
• Danish man's name with a line through the second letter (SOREN with 5 letters)
• 19th letter of Greek alphabet: pl. (TAUS with 4 letters)
• Letter-shaped hardware item (TNUT with 4 letters)