Greek Capital Letter Sigma

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

Symbol: Σ
Unicode: U+03A3
HTML entity: Σ
Category: Math Symbols

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Download Greek Capital Letter Sigma as a vector SVG or a raster PNG.

PNG size

SVG uses the system font stack — open in any vector editor and convert to outlines if needed. PNGs have a transparent background.

56 of 58 in the math symbols collection

About the greek capital letter sigma symbol

Sigma represents the eighteenth letter of the Greek alphabet and is read as a voiceless alveolar sibilant, similar to the English S. Belonging to the Greek and Coptic script block, this uppercase character serves as the structural basis for various technical symbols used throughout European literature and international communication.

This character appears frequently within the curator-assigned math symbols category, where it serves as the standard summation operator for representing the addition of a sequence of numbers. Beyond pure mathematics, it is often used in physics to denote the Stefan-Boltzmann constant or surface charge density. Occasionally, it appears in creative typography or branding to substitute for the letter E in stylized text, though it remains primarily a functional letter used in Greek writing and scientific notation.

How to type Greek Capital Letter Sigma

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 03A3 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 03A3.
Or: Control + Command + Space opens the Character Viewer — search by name.