Related Clues:

• Cultural mores
• Pi-sigma go-between
• X, in Athens
• Letter from the Corinthians
• Highest-ranking, in some hierarchies
• Platonic P
• When said three times, a crew member's fraternity?
• Greek P
• X lookalike
• P, in Greek
• It's after pi
• Tai ___
• Actor McBride
• Kind of radioactive particle
• O'Hare loc.