The answer depends on which "Sigma" you are asking about. The term "Sigma" has different meanings across various contexts. Therefore, providing a definitive "full name" requires clarification. Here's a breakdown based on common interpretations:
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If you are referring to the Greek Letter Sigma: Sigma (uppercase Σ, lowercase σ, lowercase in word-final position ς) is simply the name of the 18th letter in the Greek alphabet. It does not have a "full name" in the traditional sense. It's just called Sigma.
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If you are referring to a Character Named "Sigma" in a Video Game or Other Fictional Work: To answer this, the specific character and source (game, book, movie, etc.) needs to be identified. For instance, in Overwatch, the character Sigma's real name is Dr. Siebren de Kuiper.
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If referring to the mathematical symbol Sigma (Σ): It does not have a full name either; it's simply the uppercase Greek letter Sigma, used to represent summation.
Therefore, without knowing the context, the most accurate general answer is that Sigma does not inherently have a "full name." It's a letter of the Greek alphabet or, potentially, a codename or shortened version of a name within a specific fictional work.
