GREEK CAPITAL LETTER SIGMA

About this character

Sigma is the eighteenth letter of the Greek alphabet, descended from the Phoenician letter shin. As the capital form, Σ, it serves most prominently as the summation operator in mathematics, compactly expressing the sum of a sequence or series. In statistics, it appears in notation for population sums, while in physics it can denote cross-sections. Within programming and technical writing, Sigma is encoded as Unicode U+03A3, enabling precise typesetting in formulas and algorithmic documentation. In typography and design, its angular, monumental form evokes classical scholarship or mathematical rigor, and it is frequently employed in logos, branding, and stylistic headings. Its enduring visual identity bridges ancient script and modern notation.

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