∑

See also: Σ [U+03A3 GREEK CAPITAL LETTER SIGMA], ⵉ [U+2D49 TIFINAGH LETTER YI], ᛊ [U+16CA RUNIC LETTER SOWILO S], and Ʃ [U+01A9 LATIN CAPITAL LETTER ESH]

Translingual

Etymology

From Σ.

Symbol

∑

1. (mathematics) ∑. Sum over a set of like terms:

   $\sum _{n=1}^{2}n^{2}=1+4=5$