Capital Sigma Symbol (Σ)
Copy the Capital Sigma symbol Σ to your clipboard, and see its Unicode code point, HTML entity, LaTeX command and how to type it on any device.
What does Σ mean?
Capital Sigma is the summation operator: Σ tells you to add a sequence of terms, with the index and limits written below and above it. It is one of the most common symbols in statistics, calculus and computer science. Σ is the capital form of Sigma, letter 18 of 24 in the Greek alphabet (pronounced SIG-ma). Its lowercase counterpart is σ. In science and maths it is used for: Summation (Σ), standard deviation and stress (σ).
Codes and properties
| Character | Σ |
|---|---|
| Unicode name | GREEK CAPITAL LETTER SIGMA |
| Code point | U+03A3 |
| Decimal | 931 |
| Unicode block | Greek and Coptic |
| HTML entity | Σ · Σ · Σ |
| CSS | \03A3 |
| JavaScript / JSON | \u03A3 |
| Python | \u03A3 or \N{GREEK CAPITAL LETTER SIGMA} |
| UTF-8 bytes | CE A3 |
| LaTeX | \Sigma |
How to type Σ
- Copy & paste: press the Copy button above, then paste Σ anywhere — Word, Google Docs, email, chat or code.
- Windows (Word, WordPad, Outlook): type
03A3then press Alt+X. In any app, Win+. opens the symbol panel. - Mac: switch to the Unicode Hex Input keyboard, hold Option and type
03A3; or press Ctrl+Cmd+Space and search “greek capital letter sigma”. - Linux (GTK/IBus): press Ctrl+Shift+U, type
03a3, then Space. - HTML:
Σrenders as Σ. - LaTeX:
\Sigmain math mode (amssymb package for some symbols).
Frequently asked questions
How do I read a Σ expression?
Add every term as the index runs from the value below Σ to the value above it.
Is Σ the same as σ?
No — capital Σ means ‘sum’; lowercase σ is standard deviation.
How do I type Σ on Windows?
In Microsoft Word type 03A3 and press Alt+X. In any app press Win+. to open the symbol panel, or copy Σ from this page.
What is the HTML code for Σ?
Use Σ or Σ (hex) or Σ (decimal).
What is the LaTeX command for Σ?
Use \Sigma in math mode.