Sigma is the name of the 18th letter of the Greek alphabet, Capital sigma is written as Σ; lowercase sigma is written as σ and ς at the end of words. Sigma is transliterated as the English letter S and s. In fact, the English letter S develops from the Greek sigma. Sigma follows the pattern in masculinist subcultures of using (often sequential) letters of the Greek alphabet to create a social hierarchy of masculinity, e.g., alpha, beta, gamma, delta, and omega males.

The term sigma male seems t