HTML Entity for Cube Root (∛)
What You'll Learn
How to display the Cube Root symbol (∛) in HTML and CSS. This character is U+221B (CUBE ROOT) in the Mathematical Operators block (U+2200–U+22FF). It denotes the cube root operation in algebra and calculus—for example, ∛27 = 3 or ∛x in an expression.
There is no named HTML entity for U+221B. Use ∛, ∛, or \221B in CSS content. Do not confuse ∛ with Square Root U+221A (√) or Fourth Root U+221C (∜). See the math entities hub for square root \221A and related operators.
⚡ Quick Reference — Cube Root
U+221BMathematical Operators (U+2200–U+22FF)
∛Hexadecimal reference
∛Decimal reference
—None (use numeric refs)
Name Value
──────────── ──────────
Unicode U+221B
Hex code ∛
HTML code ∛
Named entity —
CSS code \221BComplete HTML Example
This example shows U+221B using hexadecimal and decimal character references, plus a CSS content escape. There is no named HTML entity:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\221B";
}
</style>
</head>
<body>
<p>Cube Root using Hexadecimal: ∛</p>
<p>Cube Root using HTML Code: ∛</p>
<p id="point">Cube Root using CSS Entity: </p>
</body>
</html>🌐 Browser Support
U+221B is supported in modern browsers; use a math-capable font for best glyph quality:
👀 Live Preview
See Cube Root (∛) in mathematical contexts:
🧠 How It Works
Hexadecimal Code
∛ references code point U+221B using hex digits 221B.
Decimal HTML Code
∛ is the decimal equivalent (8731) for the same character.
CSS Entity
\221B is the CSS escape for U+221B, used in the content property of ::before or ::after.
Same visual result
All three methods produce the cube-root glyph: ∛. Unicode U+221B is in Mathematical Operators (U+2200–U+22FF). No named HTML entity exists.
Use Cases
Cube Root (∛) commonly appears in:
Cube root in expressions, equations, and problem-solving (e.g. ∛x, ∛27 = 3).
Real analysis and higher math involving roots and powers.
Textbooks, online courses, tutorials, and worksheets for school and college math.
Equation editors, calculators, and formula display components on the web.
Papers, reports, and technical docs with radical notation.
Unicode tables and Mathematical Operators glossaries.
Provide context (e.g. “cube root of 27”) so screen readers convey the operation.
💡 Best Practices
Do
- Use
∛or∛for the standard cube-root glyph - Use math fonts (Cambria Math, STIX Two Math) for clear operators
- Keep hex or decimal style consistent across the document
- Use
\221Bonly inside CSScontent - Pair ∛ with operands (e.g. ∛27) for clear mathematical meaning
Don’t
- Confuse U+221B (∛) with Square Root U+221A (√) or Fourth Root U+221C (∜)
- Use ∛ when you mean square root √
- Assume a named entity exists—U+221B has none
- Put CSS escape
\221Bin HTML text nodes - Mix hex and decimal styles randomly in one file
Key Takeaways
No named entity—use numeric references
∛ ∛For CSS stylesheets, use the escape in the content property
\221BU+221B CUBE ROOT
Not √ (square) or ∜ (fourth root)—different radical operators
Three methods, one glyph — widely supported in modern browsers
❓ Frequently Asked Questions
∛ (hex), ∛ (decimal), or \221B in CSS content. There is no named HTML entity for U+221B.U+221B (Cube Root). Mathematical Operators (U+2200–U+22FF). Hex 221B, decimal 8731.∛ or ∛) go in markup. The CSS escape \221B is used in stylesheets, typically in the content property of pseudo-elements. Both render ∛.∛ or ∛. See math entities for square root and related operators.Explore More HTML Entities!
Discover 1500+ HTML character references — math operators, symbols, arrows, and more.
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