Crossword Genius

Letter after pi (3)

Ross

I believe the answer is:

rho

'letter after pi' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for rho that I've seen before include "17th Greek letter" , "Greek letter R" , "Sophocles character" , "Greek letter used as symbol for density" , "letter to Athens" .)

I've seen this clue in The New York Times, the King Feature Syndicate, the Universal, the Family Time, the USA Today, the LA Times and The Wall Street Journal.
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