Crossword Genius

Density symbol, in engineering (3)

Ross

I believe the answer is:

rho

(Other definitions for rho that I've seen before include "Gr. letter written as P" , "Greek letter used as symbol for density" , "letter to Athens" , "Seventeenth letter of the Greek alphabet" , "Something like 25 [ETA]" .)

I've seen this clue in The New York Times.
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