Sigma (σ) is a Greek letter used in mathematics and statistics. It represents a standard deviation, a measure of how spread out data is from its mean (average).
1 - The eighteenth letter of the Classical and Modern Greek alphabets, the twentieth letter of Old and Ancient.
2 - The symbol Σ, used to indicate summation of a set or series.
3 - The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
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