N-Ary Summation

A symbol from the Math Symbols collection. Click the symbol or the button below to copy.

Symbol: ∑
Unicode: U+2211
HTML entity: ∑
Category: Math Symbols

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16 of 58 in the math symbols collection

About the n-ary summation symbol

Identified by the name N-Ary Summation, this character represents a large Greek capital letter sigma and is primarily classified within the Mathematical Operators block. In academic and professional settings, it is spoken aloud as summation or simply sigma. While it shares visual characteristics with the Greek alphabet, it functions as a distinct operator in digital typography to indicate the addition of a sequence of numbers.

Typical usage occurs in scientific and technical documentation, where it serves as a shorthand for calculating totals in algebra, calculus, and statistics. Beyond pure mathematics, the symbol appears in computer programming and spreadsheet formulas to define aggregate functions. Designers also use it in branding or signage to evoke themes of science, education, or calculated precision.

How to type N-Ary Summation

Native keyboard shortcuts for each operating system — derived from the codepoint, so the steps below are always accurate.

Windows

2 options

In Word / Outlook: type 2211 then press Alt + X.
Anywhere: press Win + . to open the emoji & symbol picker, then search.

macOS

2 options

Enable “Unicode Hex Input” in System Settings → Keyboard, then hold Option and type 2211.
Or: Control + Command + Space opens the Character Viewer — search by name.