Sigma is the eighteenth letter of the Greek alphabet. However in 2010, “the ‘ sigma male’ term was coined by the far-right writer Theodore Robert Beale as a counterpoint to the alpha/beta male... What does sigma mean ? Sigma is an Internet slang term, especially among young men, referring to a man whose self-assured, dogged individualism is considered a model of status, success, and attractiveness. Many parents are now curious about the sigma meaning slang and what this popular term actually represents. This guide breaks it all down, explaining the origins, meanings, and how teens use “ sigma ” in online and everyday conversations. In general mathematics, uppercase Σ is used as an operator for summation. The Latin letter S derives from sigma while the Cyrillic letter Es derives from a lunate form of this letter. The shape (Σς) and alphabetic position of sigma is derived from the Phoenician letter (shin).