HTML Entity for Multiset Union (⊎)

Beginner

5 min read

Updated: Sep 2026

1 example

Unicode U+228E

HTML Entity for Multiset Union (U+228E) tutorial illustration

Definition

What Is the Multiset Union Entity?

Multiset Union (⊎) is the mathematical bag-union operator at Unicode U+228E. HTML5 provides &uplus;. Use it for multiset union, for example A ⊎ B.

Remember

Character     ⊎
Unicode       U+228E
Named entity  &uplus;
Hex entity    &#x228E;
Decimal       &#8846;
CSS escape    \228E

Named, hex, decimal, CSS, and a typed character all produce the same glyph: ⊎.

Reference

Quick Reference

One table for every form you will actually use.

Form	Code	Where it goes
Named entity	`&uplus;`	HTML markup (preferred)
Direct character	`⊎`	UTF-8 HTML text
Hex entity	`⊎`	HTML markup
Decimal entity	`⊎`	HTML markup
CSS escape	`\228E`	Stylesheet `content`

When to Use Which

Situation	Use
Multiset / bag union	`&uplus;`
Need an entity in HTML source	`&uplus;`, `⊎`, or `⊎`
Generated text via `::before` / `::after`	`content: "\228E"`
Ordinary set union (∪)	Use `∪` — not this page
Multiset multiplication (⊍)	See Multiset Multiplication — `&cupdot;`

See it

Live Preview

Multiset Union in a short operation and beside related symbols.

Example A ⊎ B

Large glyph ⊎

Named entity &uplus; → ⊎

vs ⊌ / ⊍ / ∪ ⊎ | ⊌ | ⊍ | ∪

With entities Named: ⊎ | Hex: ⊎ | Decimal: ⊎

Code

Complete HTML Example

One page that shows Multiset Union 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>Multiset Union (⊎)</title>
  <style>
    #point::after {
      content: "\228E";
    }
  </style>
</head>
<body>
  <p>Using Named Entity: &uplus;</p>
  <p>Using Hex Code: &#x228E;</p>
  <p>Using HTML Code: &#8846;</p>
  <p id="point">Using CSS Entity: </p>
  <p>Operation: A &uplus; B</p>
</body>
</html>

Try It Yourself

How It Works

1. Named: &uplus; is the clearest HTML form and renders ⊎.

2. Hex: U+228E → ⊎ in HTML. Same result as the named entity.

3. Decimal: same code point as 8846 → ⊎. Same result as hex and named.

4. CSS: use \228E in content (not an HTML entity). #point::after appends that ⊎ after the paragraph text.

Pitfalls & Tips

Common mistakes when working with Multiset Union.

Prefer

Use `&uplus;`

The named form is clearer than numeric references and is defined in HTML5.

vs ∪

Not ordinary set union

∪ is ∪ for sets. &uplus; is ⊎ for multiset (bag) union.

vs ⊍

Not multiset multiplication

&cupdot; is ⊍. &uplus; is ⊎. Related multiset operators, different meanings.

CSS vs HTML

Do not mix escapes

\228E belongs in CSS. &uplus; / ⊎ / ⊎ belong in HTML.

Encoding

Declare UTF-8

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

Semicolon

End references

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

Compatibility

Browser Support

Multiset Union (U+228E) and its entity forms (&uplus;, ⊎, ⊎, CSS \\228E) are supported in all mainstream browsers with a Unicode-capable font.

✓ Universal support

Multiset Union (&uplus;)

Encode with named, hex, decimal, or CSS escape — or type ⊎ 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 IE 9+

Yes*

U+228E / &uplus; Full support

Bottom line: Prefer &uplus; in mathematical HTML. Use \\228E only inside CSS content.

Remember

Key Takeaways

Unicode: Multiset Union is U+228E (decimal 8846).
HTML: prefer &uplus;.
CSS: use \228E inside content for generated text.
Lookalike: not ∪ (∪) — bags vs sets.

One line: U+228E → prefer &uplus; (also ⊎ / CSS \228E).

Frequently Asked Questions

How do I display Multiset Union in HTML using entities?

Use &uplus; (named), ⊎ (hex), ⊎ (decimal), or the CSS escape \228E in the content property. All render ⊎. Prefer &uplus; in mathematical HTML.

What is the Unicode value for Multiset Union?

U+228E (MULTISET UNION). Hex 228E, decimal 8846. It belongs to the Mathematical Operators block.

Is there a named HTML entity for U+228E?

Yes. HTML5 defines &uplus; for ⊎.

When should I use this HTML entity?

Use it in set theory and combinatorics for multiset (bag) union — for example A ⊎ B.

What is the difference between HTML code and CSS entity for U+228E?

HTML entities (&uplus;, ⊎, or ⊎) go in markup. The CSS escape \228E is used in stylesheets (usually in the content property of ::before/::after). Both render ⊎.

Is ⊎ the same as ∪?

No. Multiset Union is &uplus; (⊎, U+228E). Ordinary set union is ∪ (∪, U+222A). Different operators for bags vs sets.

Did you know?

Multiset Union is Unicode U+228E (decimal 8846) — MULTISET UNION in Mathematical Operators. HTML5 provides &uplus;. It is a bag/multiset operator (A ⊎ B), related to Multiset ⊌ and Multiset Multiplication &cupdot; (⊍). Not the same as ordinary set union ∪ (∪).

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Mari Selvan M P 🔗

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