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Sigma Symbol

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Sigma Symbol Info

Symbol	Σ
Name	Sigma
Unicode	U+03A3
HTML Entity	Σ
Windows Alt Code	Alt+228
Mac Shortcut	—

How to Type the Sigma Symbol

Copy and Paste (Easiest)

Click the Σ symbol above or the copy button. Then paste with Ctrl+V (Windows) or Cmd+V (Mac).

Windows (Alt Code)

Hold Alt and type 228 on the number pad. Release Alt.

HTML

Use Σ in your HTML code.

About the Sigma Symbol

The uppercase Sigma is a letter of the Greek alphabet widely used in mathematics to represent the sum of a series. In statistics, it denotes standard deviation when lowercase. Originating from ancient Phoenician, Sigma has become one of the most recognised mathematical symbols worldwide.

Common Uses

Summation notation, statistics, engineering, physics equations, academic papers

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