Sigma has multiple meanings depending on the context. Here are some of them:
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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 (one that does not use all caps), the final form (ς) is used.
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Statistical measurement: In statistics, sigma is a measurement of standard deviation. A five-sigma result is considered the gold standard for discovery.
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Internet slang: Sigma male is an internet slang and pseudoscientific term to describe masculine men who are independent and self-reliant. The term gained prominence within Internet culture during the late 2010s and early 2020s, and has inspired numerous memes, graffitis and videos. It is used to denote a male who is equally dominant to an alpha male, but exists outside the alpha-beta male hierarchy as a "lone wolf".
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Book: "The Sigma Male: What Women Really Want" is a book written by California plastic surgeon John T. Alexander.
It is important to note that the term "sigma male" is not scientifically recognized and is considered pseudoscientific.
