HTML Entity for Multiset Union (⊎)
What You'll Learn
How to display the Multiset Union symbol (⊎) in HTML using named, hexadecimal, decimal, and CSS escape methods. This character is U+228E (MULTISET UNION) in the Mathematical Operators block (U+2200–U+22FF)—the operator for combining multisets (bags) in set theory and combinatorics.
Render it with the named entity ⊎, ⊎, ⊎, or CSS escape \228E. This is a mathematical Unicode symbol for notation—not executable code. Pair with Multiset (⊌) and Multiset Multiplication (⊍, ⊍) in the multiset operator family.
⚡ Quick Reference — Multiset Union
U+228EMathematical Operators
⊎Hexadecimal reference
⊎Decimal reference
⊎Multiset union (u-plus)
Name Value
──────────── ──────────
Unicode U+228E
Hex code ⊎
HTML code ⊎
Named entity ⊎
CSS code \228E
Meaning Multiset union operator
Related U+228C = multiset (⊌)
U+228D = multiset multiplication (⊍, ⊍)
U+222A = set union (∪, ∪)Complete HTML Example
This example demonstrates the Multiset Union symbol (⊎) using hexadecimal code, decimal HTML code, the named entity, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\228E";
}
</style>
</head>
<body>
<p>Multiset Union using Hexadecimal: ⊎</p>
<p>Multiset Union using HTML Code: ⊎</p>
<p>Multiset Union using Named Entity: ⊎</p>
<p id="point">Multiset Union using CSS Entity: </p>
</body>
</html>🌐 Browser Support
U+228E is supported in modern browsers; use a font with Mathematical Operators coverage for consistent glyphs:
👀 Live Preview
See the Multiset Union symbol (⊎) in set theory contexts:
🧠 How It Works
Named Entity
⊎ is the HTML named entity for Multiset Union (union with plus)—often preferred in readable mathematical markup.
Hexadecimal Code
⊎ uses the Unicode hexadecimal value 228E. The x prefix indicates hexadecimal format.
Decimal HTML Code
⊎ uses the decimal Unicode value 8846 to display the same character.
CSS Entity
\228E is used in CSS stylesheets, particularly in the content property of pseudo-elements like ::before and ::after.
Same visual result
All four methods produce: ⊎. Unicode U+228E in Mathematical Operators. Related: Multiset Multiplication (⊍, ⊍).
Use Cases
The Multiset Union symbol (⊎) is commonly used in:
Union of multisets (bags) with element multiplicity preserved.
Formal notation for combining collections with repetition.
Discrete math textbooks, papers, and lecture materials.
Specification docs describing bag algebra and operations.
Online courses on sets, combinatorics, and discrete structures.
Unicode charts and HTML entity documentation.
💡 Best Practices
Do
- Use
⊎for readable multiset union markup - Pair with ⊌ and ⊍ when documenting multiset algebra
- Use fonts that cover Mathematical Operators (Cambria Math, etc.)
- Add
aria-label(e.g. “multiset union”) for accessibility - Serve pages with UTF-8 (
<meta charset="utf-8">)
Don’t
- Confuse
⊎(⊎) with∪(∪) - Assume HTML entities perform computation on multisets
- Put CSS escape
\228Ein HTML text nodes - Mix entity styles randomly in one file
- Rely on the symbol alone without accessible description
Key Takeaways
Three HTML references plus CSS all render ⊎
⊎ ⊎ ⊎For CSS stylesheets, use the escape in the content property
\228EUnicode U+228E — MULTISET UNION
⊎ is the standard named entity
Related: Multiset Multiplication (⊍) and Multiset (⊌)
❓ Frequently Asked Questions
⊎ (named), ⊎ (hex), ⊎ (decimal), or \228E in CSS content. All produce ⊎.U+228E (MULTISET UNION). Mathematical Operators block (U+2200–U+22FF). Hex 228E, decimal 8846. Named entity: ⊎.U+228E, ⊎) is the multiset union operator on bags. ∪ (U+222A, ∪) is ordinary set union. They look similar but represent different mathematical operations.⊎, ⊎, or ⊎) go directly in markup. The CSS escape \228E is used in stylesheets, typically in the content property of pseudo-elements. Same visual result, different layers of the stack.Explore More HTML Entities!
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