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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, the final form is used. In Ὀδυσσεύς, for example, the two lowercase sigmas in the center of the name are distinct from the word-final sigma at the end. The Latin letter S derives from sigma while the Cyrillic letter Es... Read More


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