Cube Root
The cube root radical extends the plain square root with a small three tucked into the checkmark shape, as in ∛27 = 3. Type it directly where a formula needs a third root and a full equation editor would be overkill. Unicode places the cube root at code point U+221B, part of the math family. Copy the ∛ with a single click below, then scroll down for every way to type it: the HTML entities, the CSS content escape, the JavaScript escape and the Windows alt code where one exists.
| Symbol | ∛ | |
|---|---|---|
| Unicode | U+221B | |
| Name | Cube Root | |
| HTML (decimal) | ∛ | |
| HTML (hex) | ∛ | |
| CSS content | \221B | |
| JavaScript / JSON | \u221B | |
| UTF-8 bytes | 0xE2 0x88 0x9B | |
| UTF-16 units | 0x221B |
How to type the cube root symbol
- Copy and paste: click the ∛ at the top of this page, then paste with Ctrl+V (Windows) or Cmd+V (Mac). This is the fastest route on any device.
- HTML: write
∛in your markup. - CSS: use
content: "\221B"in a::beforeor::afterrule. - JavaScript: the escape
\u221Bproduces this character in a string.
Frequently asked questions
How do I copy the cube root symbol?
Click the ∛ above or the copy button and it is placed on your clipboard. Paste it anywhere with Ctrl+V or Cmd+V. It is a real text character, so it works in documents, chats and code.
What is the Unicode code point for cube root?
The cube root has the Unicode code point U+221B. In HTML you can write it as ∛ or ∛.
Can I use the cube root symbol in HTML and CSS?
Yes. In HTML write ∛, and in CSS use content: "\221B" inside a ::before or ::after rule. The code table on this page has copy buttons for both.
Related symbols
Browse the full math symbols hub, or return to the searchable symbol grid.