Fourth Root Symbol
∜ is the fourth root symbol, commonly used to denote the fourth root of a value in math expressions.
U+221C
The symbol ∜ is the Unicode “FOURTH ROOT” character. It’s used in math writing where you need a compact way to represent fourth roots. You can copy it directly or use its standard Unicode escapes in code.
Fourth Root Symbol Meaning
∜ (Unicode U+221C) represents the fourth root operation. In standard mathematical notation, it’s used to express “the fourth root of a number” as a compact alternative to longer wording. For example, ∜x denotes the value whose fourth power equals x (assuming the expression is interpreted over an appropriate number system). Because it has a dedicated Unicode character, it’s useful for typed documents, math-focused web content, and equation rendering where you want consistent typography rather than building a custom root symbol.
Common uses
- •Writing fourth-root expressions in notes, worksheets, or study materials
- •Labeling variables or results in math and science documentation
- •Creating mathematical headings or inline notation in blog posts
- •Designing math-related UI text (e.g., calculators or educational apps)
- •Using the correct Unicode character in web typography to avoid mismatched symbols
Examples
∜ Fourth Root Symbol (U+221C)
- ∜The solution is ∜(16) = 2.
- ∜Compute ∜(81) and simplify the result.
- ∜Let y = ∜x for the transformation.
- ∜For x > 0, evaluate ∜(x^4).
- ∜The fourth root operation is shown as ∜.
Variations
Ready to copy
Technical codes
| Unicode | U+221C | |
| HTML Entity | ∜ | |
| HTML Code | ∜ | |
| CSS | \221C | |
| Alt Code | Alt + 8732 | |
| Decimal | 8732 |
How to type Fourth Root Symbol (∜)
On Windows
Hold Alt and type 8732 on the numeric keypad. In Word, type 221C then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 221C. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 221c, 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 Fourth Root symbol mean?
∜ (Unicode U+221C) represents the fourth root operation. In standard mathematical notation, it’s used to express “the fourth root of a number” as a compact alternative to longer wording. For example, ∜x denotes the value whose fourth power equals x (assuming the expression is interpreted over an appropriate number system). Because it has a dedicated Unicode character, it’s useful for typed documents, math-focused web content, and equation rendering where you want consistent typography rather than building a custom root symbol.
What Unicode character is the fourth root symbol?
It is Unicode “FOURTH ROOT” with code point U+221C.
How do I copy and paste ∜ in my document?
Copy the character directly as “∜”, or use the provided HTML entity (∜) depending on your platform.
What escapes can I use in code?
Common escapes are CSS: \\221C, and JavaScript: \\u{221C}. You can also use the HTML entity ∜.
Is ∜ the same as a square root or cube root?
No. ∜ specifically denotes the fourth root. Square roots and cube roots have different symbols.