sigma ( synonym found)
Definition of sigma:

(n) : the name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient; (mathematics): the symbol (?) is used to indicate summation of a set or series
Definition of sigma:

(n) : the name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient; (mathematics): the symbol (?) is used to indicate summation of a set or series
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