Definition of sigmas:
(n) :
(mathematics) The symbol Σ, used to indicate summation of a set or series.
(n) :
(statistics) The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
(n) :
The eighteenth letter of the Classical and Modern Greek alphabets (Σ, σ), the twentieth letter of Old and Ancient.
(n) :
(Internet slang) A sigma male (a self-reliant and assertive male).
(adj) :
(Internet slang) Possessing characteristics of a sigma male.
(n) :
A municipality of Capiz, Philippines.