Pi, ____, sigma (3)
I believe the answer is:
rho
(Other definitions for rho that I've seen before include "Something like 25 [ETA]" , "Greek P" , "17th Greek letter" , "Gr. letter written as P" , "letter to Athens" .)
I believe the answer is:
rho
(Other definitions for rho that I've seen before include "Something like 25 [ETA]" , "Greek P" , "17th Greek letter" , "Gr. letter written as P" , "letter to Athens" .)