σ
σ Sigma Symbol (Lowercase)
Lowercase sigma (σ) is the Greek letter used for standard deviation in statistics (σ² is variance).
Also known as: sigma symbol, standard deviation symbol, greek small letter sigma.
Codes
| Symbol | σ | |
| Unicode | U+03C3 | |
| HTML entity (named) | σ | |
| HTML entity (decimal) | σ | |
| HTML entity (hex) | σ | |
| CSS | \03C3 | |
| LaTeX | \sigma | |
| Windows Alt code | Alt + 229 |
How to type σ (Sigma Symbol (Lowercase))
WindowsAlt + 229
Hold Alt and type 229 on the numeric keypad, then release Alt (or type 03C3 then Alt + X in Word).
Mac⌥ + W
Press Option + w.
Microsoft Word03C3, Alt + X
Type 03C3, then press Alt + X to convert it to σ.
Google Docs
Insert → Special characters, then search “sigma” or “greek small letter sigma”.
LaTeX\sigma
Use \sigma in math mode.
Usage
- In statistics, σ is the population standard deviation and σ² the variance.
- The word-final form is ς (U+03C2); the uppercase Σ is used for summation.
- In physics/engineering σ can denote stress or electrical conductivity.