HTML Entity for Neither A Superset Nor Equal To (⊉)
Beginner
6 min read
Updated: Sep 2026
1 example
Unicode U+2289
Definition
What Is the Neither A Superset Nor Equal To Entity?
Neither a superset nor equal to (⊉) is the Mathematical Operators character at Unicode U+2289 (NEITHER A SUPERSET OF NOR EQUAL TO). In set theory it means A is not a superset of B and not equal to B — the negation of ⊇ (⊇). HTML5 provides the named entities ⊉ and ⊉.
Remember
Character ⊉
Unicode U+2289
Named entity ⊉ (also ⊉)
Hex entity ⊉
Decimal ⊉
CSS escape \2289
All of these produce the same glyph: ⊉. Prefer ⊉ for readable HTML; paste ⊉ in UTF-8 when convenient.
Reference
Quick Reference
One table for every form you will actually use.
Form
Code
Where it goes
Named entity
⊉
HTML markup (also ⊉)
Hex entity
⊉
HTML markup
Decimal entity
⊉
HTML markup
Direct character
⊉
HTML text (UTF-8 default)
CSS escape
\2289
Stylesheet content
When to Use Which
Situation
Use
Readable math / set theory in HTML
⊉ or ⊉
UTF-8 math text
Type or paste ⊉
Numeric entity required
⊉ or ⊉
Generated text via ::before / ::after
content: "\2289"
Positive relation (superset or equal)
⊇ / ⊇ (⊇)
See it
Live Preview
Neither a superset nor equal to rendered in common contexts.
Glyph⊉
Large glyph⊉
In a relation{1, 2} ⊉ {1, 2, 3}
With entitiesNamed: ⊉ | Hex: ⊉ | Decimal: ⊉
Related symbols⊇ (⊇) · ⊃ (⊃) · ⊈ (⊈)
Code
Complete HTML Example
One page that shows neither a superset nor equal to with named, hex, decimal, direct, and CSS forms. Use View Output or open the live editor.
Named + Hex + Decimal + Direct + CSS
Five ways to produce ⊉ in a single document.
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Neither A Superset Nor Equal To (⊉) in HTML</title>
<style>
#point::after {
content: "\2289";
}
</style>
</head>
<body>
<p>Using Named Entity: ⊉</p>
<p>Using Hex Code: ⊉</p>
<p>Using HTML Code: ⊉</p>
<p>Using Direct Character: ⊉</p>
<p id="point">Using CSS Entity: </p>
<p>Example: {1, 2} ⊉ {1, 2, 3}</p>
</body>
</html>
Using Named Entity: ⊉
Using Hex Code: ⊉
Using HTML Code: ⊉
Using Direct Character: ⊉
Using CSS Entity: ⊉
Example: {1, 2} ⊉ {1, 2, 3}
How It Works
1. Named:⊉ (or ⊉) is the clearest HTML form for U+2289.
2. Hex:U+2289 → ⊉ in HTML. Reliable numeric form.
3. Decimal: same code point as 8841 → ⊉. Same glyph.
4. Direct: paste ⊉ in a UTF-8 file with <meta charset="UTF-8">.
5. CSS: use \2289 in content (not an HTML entity). #point::after appends that ⊉ after the paragraph text.
Pitfalls & Tips
Common mistakes when working with this set-theory entity.
Meaning
Negates ⊇, not ⊃
⊉ is “notsupseteq”. For “not a superset of” alone, use ⊅ (⊅).
Aliases
⊉ = ⊉
Both named forms map to U+2289. Pick one and stay consistent.
CSS vs HTML
Do not mix escapes
\2289 belongs in CSS. ⊉ / ⊉ / ⊉ belong in HTML.
Look-alikes
Not ⊇, ⊈, or ⊅
⊇ is supseteq; ⊈ is notsubseteq; ⊅ is notsuperset. Different symbols.
Semicolon
End references
Always finish with ; — write ⊉, not &nsupe.
UTF-8
Declare charset
If you paste ⊉ directly, serve the page as UTF-8 with <meta charset="UTF-8">.
Compatibility
Browser Support
Neither a superset nor equal to (U+2289) and its entity forms (⊉, ⊉, ⊉, CSS \\2289) are supported in all mainstream browsers. Glyph availability depends on the font.
✓ Universal support
Neither A Superset Nor Equal To (⊉)
Prefer ⊉, or encode with hex, decimal, or CSS escape — same glyph everywhere.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+2289 / entitiesFull support
Bottom line: Prefer ⊉ (or ⊉) in HTML. Use ⊉ / ⊉ when a numeric form is required, and \\2289 only inside CSS content.
Remember
Key Takeaways
Unicode: neither supseteq is U+2289 (decimal 8841), Mathematical Operators.
HTML: prefer ⊉ (alias ⊉), or ⊉ / ⊉.
CSS: use \2289 inside content for generated text.
Meaning: set theory “notsupseteq” — not the same as ⊇, ⊈, or ⊅.
Use ⊉ or ⊉ (named), ⊉ (hex), ⊉ (decimal), type ⊉ in UTF-8, or the CSS escape \2289 in content. All render ⊉.
U+2289 (NEITHER A SUPERSET OF NOR EQUAL TO). Hex 2289, decimal 8841. It belongs to Mathematical Operators and means “notsupseteq” in set theory.
Yes. HTML5 defines ⊉ and ⊉ (aliases for the same character). You can also use ⊉ or ⊉.
Use it in set theory or math when A is not a superset of B and not equal to B (A ⊉ B). Prefer ⊉ for readable source. For ordinary English text, write the relation in words.
HTML entities (⊉, ⊉, or ⊉) go in markup. The CSS escape \2289 is used in stylesheets (usually in the content property of ::before/::after). Both render ⊉.
⊇ (U+2287, ⊇) means superset or equal. ⊃ (U+2283, ⊃) means superset of. ⊈ (U+2288, ⊈) is neither a subset nor equal to. ⊉ specifically negates ⊇. Do not substitute one for another.
🤔
Did you know?
Neither a superset nor equal to (⊉) is Unicode U+2289 (decimal 8841) — NEITHER A SUPERSET OF NOR EQUAL TO in Mathematical Operators. HTML5 provides ⊉ and ⊉ (same glyph). It negates ⊇ / ⊇ (⊇). Pair with ⊈ (⊈) for the subset side.
