Related Clues:

• Geometric ratios
• Some sorority letters
• Trigonometric ratios
• Corinth consonants
• Dicks
• Letters on some college buildings
• TV's Magnum et al.
• Geometry symbols
• Circumference-to-diameter ratios
• Circle figures
• TV's Rockford et al.
• They're marked on some math tests
• Math figures
• Detectives, briefly
• Trenchcoated antiheroes