Someone who asserts male dominance, is usually used in conversations with girls.
Guy 1: Dude, I'm such a sigma!
Guy 2: That's so cap, dude
A sigma is a version of an alpha but just better cause there can only be one sigma
Litral: the 8th letter in the Greek alphabet
Or a symbol in mathematics
Slang: So show dominated power leader
Also sigma is the highest rank and the worst is Alpha or the opposit meaning beta
Sigma