Related Clues:

• P, on a fraternity house
• Sigma neighbor
• Sigma follows it
• Christogram component, sometimes
• Aristotle's P
• Letter in Socrates' name
• Uses finger paint, say
• Applies gently
• "P" on fraternity row
• 'P' as in Ptolemy
• Slight touches
• Letter on some euros
• P, to the Greeks
• When written three times, fraternity in 'Revenge of the Nerds'
• Small amounts of sunscreen