√
√ Square Root Symbol
The square-root sign (√), or radical, denotes the square root of a number: √9 = 3.
Also known as: radical sign, sqrt symbol, root symbol.
Codes
| Symbol | √ | |
| Unicode | U+221A | |
| HTML entity (named) | √ | |
| HTML entity (decimal) | √ | |
| HTML entity (hex) | √ | |
| CSS | \221A | |
| LaTeX | \sqrt{} | |
| Windows Alt code | Alt + 251 |
How to type √ (Square Root Symbol)
WindowsAlt + 251
Hold Alt and type 251 on the numeric keypad, then release Alt (Alt + 8730 also works).
Mac⌥ + V
Press Option + v.
Microsoft Word221A, Alt + X
Type 221A, then press Alt + X to convert it to √.
Google Docs
Insert → Special characters, then search “square root” — or use an Equation and type \sqrt.
LaTeX\sqrt{x}
Use \sqrt{x} in math mode (\sqrt[3]{x} gives a cube root).
Usage
- √ is the square-root sign: √9 = 3 and √2 ≈ 1.414.
- Add an index for other roots: ∛8 = 2 (cube root).
- In LaTeX, \sqrt{x} draws the radical with an overbar over x.