Related Clues:

• Followers of pis
• P's on frat jackets
• P's
• Preceders of sigmas
• P's, to Pericles
• 17th letters of an alphabet
• Greek p's
• P look-alikes
• P P P, in Greek
• Plato’s P’s
• Certain Greek letters
• Greek letters that look like P's
• Sigma preceders
• Letters that follow pis
• Density symbols