What is greek alphabet 19th letter?

The 19th letter of the Greek alphabet is sigma (Σ, σ). It is pronounced as "s" when it appears at the beginning or in the middle of a word and as "z" when it appears at the end of a word. In mathematics, it is commonly used to represent the summation of a series of numbers or variables. In science, it is used to represent the standard deviation of a set of data. Sigma is also commonly used in fraternity and sorority names as a symbol of brotherhood or sisterhood.

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