Greek Small Letter Sigma Symbol

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

Symbol: σ
Unicode: U+03C3
HTML entity: σ
Category: Math Symbols

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93 of 96 in the math symbols collection

About the greek small letter sigma symbol

In mathematical notation, this character represents the sum of a sequence of terms, a usage established by Leonhard Euler in the 18th century. As the lowercase form of the eighteenth letter of the Greek alphabet, it corresponds to the Roman letter S and has a numeric value of 200 in the Greek numeral system. In Modern Greek, it appears in words like "σχολείο" (school) and is the standard lowercase form used in most contexts, though a separate final sigma (ς) is employed at the end of a word.

How to type Greek Small 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 03C3 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 03C3.
Or: Control + Command + Space opens the Character Viewer — search by name.