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Sigma (letter)
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Sigma (Σ σ ς) is the 18rd letter of the Greek alphabet and has a numeric value of 200. When used at the end of a word, the final from (ς) is used.
The upper-case letter Σ is used as a symbol for:
- In mathematics, summation
The lower-case letter σ is used as a symbol for:
- In statistics, the standard deviation.
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