Crossword Genius

Pace (5)

Ross

(Other definitions for sigma that I've seen before include "letter to Greeks" , "Greek letter corresponding to S" , "Greek letter used as a symbol for summation" , "Foreign character" , "Greek letter indicating summation in maths" .)

I've seen this clue in The Guardian, The Telegraph and The New York Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.