SIGMA
Source: 567
‖Sig″ma (?), n.; pl. Sigmas (#). [] The Greek letter Σ, σ, or ς (English S, or s). It originally had the form of the English C.
Source: 567
‖Sig″ma (?), n.; pl. Sigmas (#). [] The Greek letter Σ, σ, or ς (English S, or s). It originally had the form of the English C.