Cube Root Symbol
The cube root symbol ∛表示 “the number whose cube equals the value.”
U+221B
The symbol ∛ represents the cube root of a number. It’s used in mathematics, education content, and technical writing. You can copy it directly or insert it via its Unicode code point.
Cube Root Symbol Meaning
The cube root symbol ∛ indicates the cube root of a value: ∛x is the number that, when multiplied by itself three times, gives x (in other words, (∛x)³ = x). This symbol is most common in algebra, problem-solving, and formulas where expressions involve cubic relationships. In typesetting and publishing, using ∛ helps keep equations compact and readable compared to writing out “cube root” in full. It is also useful in digital content—such as captions, worksheets, and developer documentation—when you want a consistent mathematical notation style.
Common uses
- •Writing algebraic formulas involving cubic relationships
- •Teaching and learning cube root operations in worksheets and notes
- •Labeling variables or results in STEM reports and presentations
- •Formatting math in blogs, docs, and educational articles
- •Rendering mathematical expressions consistently in digital design
Examples
∛ Cube Root Symbol
- ∛∛8 = 2
- ∛Find ∛27
- ∛The value of ∛(x + 5) increases as x grows
- ∛Compute ∛0.125 to get the cube root
- ∛Let y = ∛(a^3 + b)
Variations
Ready to copy
Technical codes
| Unicode | U+221B | |
| HTML Entity | ∛ | |
| HTML Code | ∛ | |
| CSS | \221B | |
| Alt Code | Alt + 8731 | |
| Decimal | 8731 |
How to type Cube Root Symbol (∛)
On Windows
Hold Alt and type 8731 on the numeric keypad. In Word, type 221B then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 221B. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 221b, then press Enter or Space.
Anywhere
Copy ∛ with the button above and paste it wherever you need it — this works on every device and in every app, with no keyboard shortcut to remember.
FAQ
What does the cube root symbol ∛ mean?
It means “cube root of.” For example, ∛8 = 2 because 2³ = 8.
How do I copy the symbol ∛ into HTML?
You can use the HTML entity: ∛ .
How do I enter ∛ in CSS?
Use the CSS escape form: \\221B .
How do I write ∛ in JavaScript strings?
Use the JavaScript escape: \\u{221B} .