Summation symbol in math

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Now we are looking on the crossword clue: Summation symbol in math.
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Possible Answers: SIGMA.

Random information on “Sigma”:
Sigma (upper case Σ, lower case σ, lower case in word-final position ς; Greek σίγμα) is the eighteenth letter of the Greek alphabet, and carries the ‘S’ sound. In the system of Greek numerals it has a value of 200. When used at the end of a word, and the word is not all upper case, the final form (ς) is used, e.g. Ὀδυσσεύς (Odysseus) – note the two sigmas in the center of the name, and the word-final sigma at the end.
Taken from Wikipedia