HTML Entity for Neither A Superset Nor Equal To (⊉)
What You'll Learn
How to display the Neither A Superset Nor Equal To symbol (⊉) in HTML using named, hexadecimal, decimal, and CSS escape methods. This character is U+2289 (NEITHER A SUPERSET OF NOR EQUAL TO) in the Mathematical Operators block (U+2200–U+22FF)—used in set theory to state that one set is not a superset of another and is not equal to it.
Render it with the named entity ⊉, ⊉, ⊉, or CSS escape \2289. Compare with the dual relation Neither A Subset Nor Equal To (⊈) and related superset symbols.
⚡ Quick Reference — nsupe
U+2289Mathematical Operators
⊉Hexadecimal reference
⊉Decimal reference
⊉Most readable in math markup
Name Value
──────────── ──────────
Unicode U+2289
Hex code ⊉
HTML code ⊉
Named entity ⊉
CSS code \2289
Meaning Neither a superset of nor equal to
Related U+2283 = superset (⊃, ⊃)
U+2287 = superset or equal (⊇, ⊇)
U+2288 = neither subset nor equal (⊈)Complete HTML Example
This example demonstrates ⊉ using hexadecimal code, decimal HTML code, the named entity, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point::after{
content: "\2289";
}
</style>
</head>
<body>
<p>⊉ using Hexadecimal: ⊉</p>
<p>⊉ using HTML Code: ⊉</p>
<p>⊉ using Named Entity: ⊉</p>
<p id="point">⊉ using CSS Entity: </p>
</body>
</html>🌐 Browser Support
U+2289 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+2289—the most readable choice when writing set-relation markup.
Hexadecimal Code
⊉ uses the Unicode hexadecimal value 2289. The x prefix indicates hexadecimal format.
Decimal HTML Code
⊉ uses the decimal Unicode value 8841 to display the same character.
CSS Entity
\2289 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+2289 in Mathematical Operators. Dual relation: ⊈ (neither subset nor equal).
Use Cases
The ⊉ symbol (⊉) is commonly used in:
Expressing that one set is not a superset of and not equal to 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 or equal) and ⊈ (neither subset nor equal)
- Add
aria-labelfor standalone relation symbols - Serve pages with UTF-8 (
<meta charset="utf-8">)
Don’t
- Confuse ⊉ (
⊉) with ⊈ (neither subset nor equal) - Use padded Unicode notation like U+02289—the correct value is
U+2289 - Put CSS escape
\2289in HTML text nodes - Use
\02289in CSS—the correct escape is\2289 - Rely on the glyph alone without accessible description
Key Takeaways
Three HTML references plus CSS all render ⊉
⊉ ⊉ ⊉For CSS stylesheets, use the escape in the content property
\2289Unicode U+2289 — NEITHER A SUPERSET OF NOR EQUAL TO
Mathematical Operators block (U+2200–U+22FF)
⊉ is the preferred named entity for readable source markup
❓ Frequently Asked Questions
⊉ (named), ⊉ (hex), ⊉ (decimal), or \2289 in CSS content. All produce ⊉.U+2289 (NEITHER A SUPERSET OF NOR EQUAL TO). Mathematical Operators block (U+2200–U+22FF). Hex 2289, decimal 8841. Named entity: ⊉.⊉, ⊉, or ⊉) go directly in markup. The CSS escape \2289 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+2289 and is the most readable option in source markup.Explore More HTML Entities!
Discover 1500+ HTML character references — set relations, math operators, logic symbols, and more.
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