HTML Entity for Not a Superset Of (⊅)
What You'll Learn
How to display the Not a Superset Of symbol (⊅) in HTML using named, hexadecimal, decimal, and CSS escape methods. This character is U+2285 (NOT A SUPERSET OF) in the Mathematical Operators block (U+2200–U+22FF)—used in set theory to state that one set is not a superset of another (e.g. A ⊅ B).
Render it with the named entity ⊅, ⊅, ⊅, or CSS escape \2285. Compare with Neither A Superset Nor Equal To (⊉, ⊉) and related superset symbols.
⚡ Quick Reference — Not a Superset Of
U+2285Mathematical Operators
⊅Hexadecimal reference
⊅Decimal reference
⊅HTML5 named entity for U+2285
Name Value
──────────── ──────────
Unicode U+2285
Hex code ⊅
HTML code ⊅
Named entity ⊅
CSS code \2285
Meaning Not a superset of
Related U+2283 = superset (⊃, ⊃)
U+2287 = superset or equal (⊇, ⊇)
U+2289 = neither superset nor equal (⊉, ⊉)
Block Mathematical Operators (U+2200–U+22FF)Complete HTML Example
A simple example showing ⊅ using hexadecimal code, decimal HTML code, the named entity, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point::after{
content: "\2285";
}
</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
U+2285 is widely supported wherever Unicode Mathematical Operators render correctly:
👀 Live Preview
See ⊅ in set theory and mathematical relation contexts:
🧠 How It Works
Named Entity
⊅ is the HTML named entity for U+2285—the most readable choice when writing set-relation markup.
Hexadecimal Code
⊅ uses the Unicode hexadecimal value 2285. The x prefix indicates hexadecimal format.
Decimal HTML Code
⊅ uses the decimal Unicode value 8837 to display the same character.
CSS Entity
\2285 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+2285 in Mathematical Operators (U+2200–U+22FF).
Use Cases
The ⊅ symbol (⊅) is commonly used in:
Expressing that one set is not a superset of another.
Discrete math textbooks, papers, and lecture notes published as HTML.
Formal proofs and definitions involving superset relations.
Data structures and algorithms courses covering set operations.
Interactive math modules with web-based notation.
Unicode charts and HTML entity documentation for math symbols.
💡 Best Practices
Do
- Use
⊅for readable set-relation markup - Pair ⊅ with plain-language description on first use
- Distinguish from ⊃ (superset) and ⊉ (neither superset nor equal)
- Add
aria-labelfor standalone relation symbols - Serve pages with UTF-8 (
<meta charset="utf-8">)
Don’t
- Confuse ⊅ (
⊅) with ⊉ (⊉) - Confuse
⊅with⊄(not a subset of, U+2284) - Use padded Unicode notation like U+02285—the correct value is
U+2285 - Put CSS escape
\2285in HTML text nodes - Use
\02285in CSS—the correct escape is\2285
Key Takeaways
Three HTML references plus CSS all render ⊅
⊅ ⊅ ⊅For CSS stylesheets, use the escape in the content property
\2285Unicode U+2285 — NOT A SUPERSET OF
Mathematical Operators block (U+2200–U+22FF)
⊅ is the preferred named entity for readable source markup
❓ Frequently Asked Questions
⊅ (named), ⊅ (hex), ⊅ (decimal), or \2285 in CSS content. All produce ⊅.U+2285 (NOT A SUPERSET OF). Mathematical Operators block (U+2200–U+22FF). Hex 2285, decimal 8837. Named entity: ⊅.⊅, ⊅, or ⊅) go directly in markup. The CSS escape \2285 is used in stylesheets, typically in the content property of pseudo-elements. Same visual result, different layers of the stack.⊅ is the named HTML entity for U+2285 and is the most readable option in source markup.Explore More HTML Entities!
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