Related Clues:
- Greek character is quietly retreating
- Penultimate of 24 letters
- Letter that sounds like an expression of relief
- First Greek letter in "Psyche"
- Next-to-last letter in the Greek alphabet
- (K) Bike-tire letters
- Postie occasionally delivers foreign letter
- Letter before 22-Down
- Greek homophone of 47-Across
- Letter written in the center of stop signs?
- Letter eight after omicron
- ___ Chi (psychology honor society)
- Letters on bike tires
- Greek letter that looks like a pitchfork
- Tire spec