Crossword Genius

Greek letter used to indicate summation in mathematics (5)

Ross

I believe the answer is:

sigma

(Other definitions for sigma that I've seen before include "character in Athens" , "Gr. letter; rhymes with mark of disgrace" , "Foreign character" , "Greek letter signifying sum in maths" , "Agism of the Greek letter" .)

I've seen this clue in The Times.
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