SIGMA

Mon, 10 Feb '25

Summation symbol, in math

Tue, 21 Jan '25

Greek letter that represents summation

Mon, 1 May '23

Greek "S"

Sat, 25 Mar '23

It's at the end of "Oedipus"

Sat, 28 Aug '21

Symbol for stock volatility, in finance

Mon, 15 Mar '21

Letter after rho