HTML Entity for Volume Integral (∰)
What You'll Learn
How to display the Volume Integral symbol (∰) in HTML using hexadecimal, decimal, named entity, and CSS escape methods. This character is U+2230 (VOLUME INTEGRAL) in the Mathematical Operators block—a triple integral operator used in calculus, physics, and engineering notation.
Render it with ∰, ∰, the named entity ∰, or CSS escape \2230. Do not confuse ∰ with contour integral ∮ (∮) or surface integral ∯ (∯).
⚡ Quick Reference — Volume Integral Entity
U+2230Mathematical Operators
∰Hexadecimal reference
∰Decimal reference
∰Most readable option
Name Value
──────────── ──────────
Unicode U+2230
Hex code ∰
HTML code ∰
Named entity ∰
CSS code \2230
Meaning Volume (triple) integral
Related U+222E = ∮ (contour integral, ∮)
U+222F = ∯ (surface integral, ∯)
Block Mathematical Operators (U+2200–U+22FF)Complete HTML Example
A simple example showing the Volume Integral symbol (∰) using hexadecimal code, decimal HTML code, named entity, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\2230";
}
</style>
</head>
<body>
<p>Symbol (hex): ∰</p>
<p>Symbol (decimal): ∰</p>
<p>Symbol (named): ∰</p>
<p id="point">Symbol (CSS): </p>
</body>
</html>🌐 Browser Support
The Volume Integral symbol (∰) is supported in modern browsers when the font includes Mathematical Operators glyphs:
👀 Live Preview
See the Volume Integral symbol rendered live in mathematical contexts:
∯)🧠 How It Works
Hexadecimal Code
∰ uses the Unicode hexadecimal value 2230 to display the character. The x prefix indicates hexadecimal format.
Decimal HTML Code
∰ uses the decimal Unicode value 8752 to display the same character. A common method for Mathematical Operators.
Named Entity
∰ is the semantic named entity—the easiest to read in source HTML for the volume integral operator.
CSS Entity
\2230 is used in CSS stylesheets, particularly in the content property of pseudo-elements like ::before and ::after.
Same visual result
All four methods produce the glyph: ∰. Unicode U+2230 sits in Mathematical Operators. Not the same as ∯ (∯) or ∮ (∮).
Use Cases
The Volume Integral symbol (∰) is commonly used in:
Calculus equations and triple integral notation.
Theoretical physics and scientific documentation with volume integrals.
Technical specifications and engineering calculations.
Research papers and educational materials on advanced mathematics.
Software and scientific guides involving mathematical notation.
Equation documentation and problem-solving content.
Research articles requiring volume integral notation.
💡 Best Practices
Do
- Use
∰for readable source markup - Pair ∰ with subscripts and integrand for clear equations
- Pick one entity style per project for consistency
- Use fonts that support Mathematical Operators
- Distinguish ∰ from ∯ (
∯) and ∮ (∮)
Don’t
- Confuse ∰ (U+2230) with ∯ (U+222F, surface integral)
- Substitute ∮ (
∮) when ∰ is specifically required - Mix entity styles randomly in one file
- Use CSS escape
\2230inside HTML markup - Forget accessibility labels for standalone math symbols
Key Takeaways
Type ∰ directly, or use hex/decimal/named references
∰ ∰ ∰For CSS stylesheets, use the escape in the content property
\2230Unicode U+2230 — VOLUME INTEGRAL
Not the same as ∯ (∯) or ∮ (∮)
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❓ Frequently Asked Questions
∰ (hex), ∰ (decimal), ∰ (named), or \2230 in CSS content. All produce ∰. In UTF-8 you can also type ∰ directly.U+2230 (VOLUME INTEGRAL). Mathematical Operators block. Hex 2230, decimal 8752. Named entity ∰. Related: U+222F (∯, ∯) is surface integral.∰, ∰, or ∰) go directly in markup. The CSS escape \2230 is used in stylesheets, typically in the content property of ::before or ::after. Same visual result, different layers of the stack.∰ is the named HTML entity for ∰ (U+2230). ∰ and ∰ are equivalent in modern browsers. Do not confuse ∰ with ∯ (∯, surface integral).Explore More HTML Entities!
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