Sigma has multiple meanings, depending on the context. Here are some of the most common meanings:
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Greek letter: Sigma is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for summation. When used at the end of a letter-case word, the final form is lowercase σ or lowercase in word-final position ς.
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Slang term for a personality type: Sigma male is an internet slang and pseudoscientific term to describe masculine men who exist outside the alpha-beta male hierarchy as a "lone wolf." They are characterized as being highly independent and original with little or no regard to societal perceptions. They share many traits in common with the alpha archetype, though their tendency to walk outside of the lines of traditional social dominance hierarchies sets them apart and makes them different.
In summary, Sigma can refer to a Greek letter or a personality type in internet slang.
