sigma

/siɡma/
1.
nounmasculineSing

the 18th letter of the Greek alphabet

the mathematical symbol for summation (uppercase Σ)

standard deviation (symbol σ) in statistics

On note la somme des termes par le sigma majuscule Σ.

We denote the sum of the terms by the uppercase sigma Σ.

2.
nounmasculineSing

informal internet slang for a man described as independent, solitary and self-reliant (''sigma male'')

Depuis qu'il a commencé la muscu, il se prend pour un vrai sigma.

Since he started working out, he thinks he's a real sigma.