HTML Entity for Not a Superset Of (⊅)

Beginner

5 min read

Updated: Sep 2026

1 example

Unicode U+2285

HTML Entity for not a superset of (U+2285) tutorial illustration

Definition

What Is the Not a Superset Of Entity?

Not a superset of (⊅) is the Mathematical Operators character at Unicode U+2285 (NOT A SUPERSET OF). In set theory it states that one set is not a superset of another — for example A ⊅ B.

Remember

Character     ⊅
Unicode       U+2285
Named entity  &nsup;
Hex entity    &#x2285;
Decimal       &#8837;
CSS escape    \2285
Affirmative   &sup; (⊃, U+2283)

Named, hex, decimal, CSS, and a typed character all produce the same glyph: ⊅. Prefer &nsup; in HTML source for clarity.

Reference

Quick Reference

One table for every form you will actually use.

Form	Code	Where it goes
Named entity	`&nsup;`	HTML markup (best default)
Hex entity	`⊅`	HTML markup
Decimal entity	`⊅`	HTML markup
CSS escape	`\2285`	Stylesheet `content`
Direct character	`⊅`	UTF-8 HTML text

When to Use Which

Situation	Use
Readable HTML source	`&nsup;`
Numeric entity required	`⊅` or `⊅`
Generated text via `::before` / `::after`	`content: "\2285"`
Affirmative ⊃	`⊃` — see Superset Of
Not a subset ⊄	`&nsub;` — see Not Subset Of

See it

Live Preview

Not a superset of in set-theory and comparison contexts.

Relation A ⊅ B

Large glyph ⊅

Named entity &nsup; → ⊅

vs ⊃ / ⊇ / ⊄ ⊅ | ⊃ | ⊇ | ⊄

With entities Named: ⊅ | Hex: ⊅ | Decimal: ⊅

Code

Complete HTML Example

One page that shows this symbol with named, hex, decimal, and CSS forms. Use View Output or open the live editor.

Named + Hex + Decimal + CSS

Four ways to produce ⊅ in a single document.

html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Not a Superset Of (&nsup;)</title>
  <style>
    #point::after {
      content: "\2285";
    }
  </style>
</head>
<body>
  <p>Using Named Entity: &nsup;</p>
  <p>Using Hex Code: &#x2285;</p>
  <p>Using HTML Code: &#8837;</p>
  <p id="point">Using CSS Entity: </p>
  <p>Example: A &nsup; B</p>
</body>
</html>

Try It Yourself

How It Works

1. Named: &nsup; is the clearest HTML form and renders ⊅.

2. Hex: U+2285 → ⊅ in HTML. Same result as the named entity.

3. Decimal: same code point as 8837 → ⊅. Same result as hex.

4. CSS: use \2285 in content (not an HTML entity). #point::after appends that ⊅ after the paragraph text.

Pitfalls & Tips

Common mistakes when working with the not-a-superset entity.

Pair

`&nsup;` ≠ `⊃`

&nsup; is the negation. ⊃ is the affirmative superset of (⊃).

Look-alikes

Not `&nsub;`, `&supe;`, or `&nsupe;`

&nsub; is not a subset. &supe; is ⊇. &nsupe; is ⊉ — a stronger combined negation.

CSS vs HTML

Do not mix escapes

\2285 belongs in CSS. &nsup; / ⊅ / ⊅ belong in HTML.

Element

Not `∉`

∉ (∉) is membership negation. &nsup; is superset negation — different relations.

Encoding

Declare UTF-8

If you paste ⊅ directly, keep <meta charset="UTF-8"> so the file is not misread.

Semicolon

End references

Always finish with ; — write &nsup;, not &nsup.

Compatibility

Browser Support

Not a superset of (U+2285) and its entity forms (&nsup;, ⊅, ⊅, CSS \\2285) are supported in all modern browsers. Glyph availability depends on the font.

✓ Universal encoding

Not a Superset Of (&nsup;)

Encode with named, hex, decimal, or CSS escape — or paste ⊅ directly in UTF-8 HTML.

100% Browser coverage

Google Chrome Supported

Yes

Microsoft Edge Supported

Yes

Mozilla Firefox Supported

Yes

Apple Safari Supported

Yes

Opera Supported

Yes

Internet Explorer All versions

Yes

U+2285 Full support

Bottom line: Prefer &nsup; for readable HTML. Use \\2285 only inside CSS content.

Remember

Key Takeaways

Unicode: this character is U+2285 (decimal 8837).
HTML: prefer &nsup; — or use ⊅ / ⊅.
CSS: use \2285 inside content for generated text.
Watch out: &nsup; ≠ ⊃ ≠ &nsub; ≠ &nsupe;.

One line: U+2285 → &nsup; / ⊅ / ⊅ / CSS \2285.

Frequently Asked Questions

How do I display not a superset of (⊅) in HTML using entities?

Use &nsup; (named), ⊅ (hex), ⊅ (decimal), or the CSS escape \2285 in the content property. All render ⊅. Prefer &nsup; in HTML source.

What is the Unicode value for nsup?

U+2285 (NOT A SUPERSET OF). Hex 2285, decimal 8837. It belongs to the Mathematical Operators block (U+2200–U+22FF).

Is there a named HTML entity for U+2285?

Yes. &nsup; is the HTML5 named entity for ⊅. Related: ⊃ for ⊃ (U+2283) and &nsub; for ⊄ (U+2284).

When should I use this HTML entity?

Use it in set theory and mathematics when one set is not a superset of another (e.g. A ⊅ B). Prefer &nsup; for readable source.

What is the difference between HTML code and CSS entity for U+2285?

HTML entities (&nsup;, ⊅, or ⊅) go in markup. The CSS escape \2285 is used in stylesheets (usually in the content property of ::before/::after). Both render ⊅.

How is ⊅ different from ⊃, ⊇, or ⊉?

⊃ (⊃) is superset of. ⊇ (&supe;) is superset of or equal to. ⊅ (&nsup;) means not a superset of. ⊉ (U+2289, &nsupe;) is neither a superset of nor equal to — a stronger combined negation.

Did you know?

Not a superset of (⊅) is Unicode U+2285 (decimal 8837) in Mathematical Operators. HTML5 provides &nsup; — the most readable form. It negates superset of (⊃, ⊃, U+2283). Related: &nsub; (⊄, not a subset) and &nsupe; (⊉, neither a superset nor equal).

Next: Not Almost Equal To

Learn the HTML entity for ≉ — next in this sequence.

Continue tutorial →

About the author

Mari Selvan M P 🔗

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Experience 12 years building web and cloud systems
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