HTML Entity for Intersection (∩)
What You'll Learn
How to display the Intersection symbol (∩) in HTML using hexadecimal, decimal, named entity, and CSS escape methods. In set theory, A ∩ B is the set of elements common to both A and B.
This character is U+2229 (INTERSECTION) in the Mathematical Operators block (U+2200–U+22FF). Render it with ∩, ∩, ∩, or CSS \2229. Do not confuse ∩ (cap) with ∪ (cup / union, ∪).
⚡ Quick Reference — Intersection
U+2229Mathematical Operators
∩Hexadecimal reference
∩Decimal reference
∩Most readable option
Name Value
──────────── ──────────
Unicode U+2229
Hex code ∩
HTML code ∩
Named entity ∩
CSS code \2229
Meaning Set intersection (cap)
Related U+222A = union (∪)
CSS note \2229 or \02229 in content propertyComplete HTML Example
This example demonstrates the Intersection symbol (∩) using hexadecimal code, decimal HTML code, the named entity, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\2229";
}
</style>
</head>
<body>
<p>Intersection using Hexadecimal: ∩</p>
<p>Intersection using Decimal: ∩</p>
<p>Intersection using Named Entity: ∩</p>
<p id="point">Intersection using CSS Entity: </p>
</body>
</html>🌐 Browser Support
The Intersection symbol (∩) is universally supported in all modern browsers:
👀 Live Preview
See the Intersection symbol (∩) in set theory and probability contexts:
🧠 How It Works
Hexadecimal Code
∩ uses the Unicode hexadecimal value 2229 to display the Intersection symbol. The x prefix indicates hexadecimal format.
Decimal HTML Code
∩ uses the decimal Unicode value 8745 to display the same character.
CSS Entity
\2229 is used in CSS stylesheets, particularly in the content property of pseudo-elements like ::before and ::after.
Named Entity
∩ is the standard named HTML entity for set-theoretic intersection (mnemonic: “cap”).
Same visual result
All four methods produce ∩. Unicode U+2229 is in Mathematical Operators. Next: Inverted Breve.
Use Cases
The Intersection symbol (∩) is commonly used in:
A ∩ B = elements belonging to both A and B.
Overlapping regions and visual explanations of set operations.
Proofs, definitions, and formulas involving set intersection.
Textbooks, courses, and academic papers in mathematics.
Document INTERSECT queries and set-based operations.
P(A ∩ B) for intersection of events.
💡 Best Practices
Do
- Use
∩for readable source markup - Label sets clearly (A ∩ B) in educational content
- Pick one style (hex / decimal / named) per project
- Use MathML or ARIA for complex set expressions
- Test rendering with math-friendly fonts
Don’t
- Confuse ∩ (intersection /
∩) with ∪ (union /∪) - Use CSS
\2229inside HTML text nodes - Mix entity styles randomly in one file
- Assume readers know notation without context
- Confuse set ∩ with logical ∧ (and) in prose
Key Takeaways
Three HTML references all render ∩
∩ ∩ ∩For CSS stylesheets, use \2229 in the content property
Unicode U+2229 — INTERSECTION (Mathematical Operators)
Prefer ∩ for readability—union uses ∪ (∪)
Previous: Interrobang Next: Inverted Breve
❓ Frequently Asked Questions
∩ (hex), ∩ (decimal), ∩ (named), or \2229 in CSS content. All produce ∩.U+2229 (INTERSECTION). Mathematical Operators block (U+2200–U+22FF). Hex 2229, decimal 8745. Denotes set intersection in math and logic.∩, ∩, or ∩) go in markup. The CSS escape \2229 is used in stylesheets, typically on ::before or ::after. Both render ∩.∩ is the named HTML entity for ∩ (intersection). It is part of the HTML5 entity set and is well supported in modern browsers. Union uses ∪ for ∪.Explore More HTML Entities!
Discover 1500+ HTML character references — set theory, math operators, and more.
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