Capital Sigma Symbol (Σ)

Copy and paste the capital sigma Σ with one click

Unicode Character

Unicode Hex

U+03A3

HTML Entity

Decimal Code

931

About the Capital Sigma Symbol

Last reviewed on October 31, 2026

Capital Σ is the summation sign when written with limits, as in Σ xᵢ from 1 to n. Statistics also uses it for a covariance matrix. A bigger form ∑ is the dedicated math operator.

Its official Unicode name is Greek Capital Letter Sigma. Browse the Greek Letters page for related characters.

How to Type Capital Sigma on a Keyboard

Windows: Hold Alt and type 228 on the numeric keypad

Mac: Press Ctrl+Cmd+Space to open the Character Viewer, then search for the symbol by name

Microsoft Word: Type 03A3 then press Alt+X

Phone & tablet: Copying Σ from this page is fastest — see our mobile typing guide

Capital Sigma Code for HTML, CSS & JavaScript

HTML: Σ

CSS: content: '\03A3';

JavaScript: '\u03A3'

Unicode: U+03A3

Frequently Asked Questions

How do I type capital sigma Σ on Windows?

Hold Alt and type 228 on the numeric keypad. You can also copy Σ straight from this page.

How do I type Σ on a Mac?

Press Ctrl+Cmd+Space to open the Character Viewer, then search for the symbol by name.

What is the Unicode and HTML code for capital sigma?

It is Unicode code point U+03A3, named Greek Capital Letter Sigma. In HTML, use Σ or the numeric reference Σ.