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 King Feature Syndicate, the Family Time, the USA Today, the Universal, the Newsday, the LA Times, The Wall Street Journal and The New York Times.
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