Sigma Symbol Σ
Tap the button to copy the sigma symbol, or grab a variant below. The table has its Alt code, HTML entity and Unicode details.
| Copy | Unicode name | Codepoint | HTML | Windows Alt code |
|---|---|---|---|---|
| Greek Capital Letter Sigma | U+03A3 | Σ | Alt+228 | |
| Greek Small Letter Sigma | U+03C3 | σ | Alt+229 | |
| Greek Small Letter Final Sigma | U+03C2 | ς | none | |
| N-Ary Summation | U+2211 | ∑ | none |
- The sigma symbol is Unicode U+03A3 (Greek Capital Letter Sigma).
- In HTML, type
Σto get Σ. - On Windows, hold Alt and type 228 on the numeric keypad.
- On a Mac, press Option+W.
- It is a single character: it survives copy and paste into any text field and counts as one character against limits.
Capital sigma is the summation sign of mathematics; Unicode also defines the dedicated n-ary summation ∑, which is what the Mac shortcut Option+W actually types. Lowercase sigma stands for standard deviation in statistics. The final-position form ς is used only at the end of Greek words.