HTML Entity for Double Subset (⋐)

Beginner

5 min read

Updated: Sep 2026

1 example

Unicode U+22D0

HTML Entity for double subset (U+22D0) tutorial illustration

Definition

What Is Double Subset?

Double subset (⋐) is the Unicode character at U+22D0 in the Mathematical Operators block. Official name: DOUBLE SUBSET. It is used in set theory and mathematical notation for a double-subset relation.

Remember

Character     ⋐
Unicode       U+22D0
Named entity  &Sub;
Hex entity    &#x22D0;
Decimal       &#8912;
CSS escape    \22D0
Not the same  ⊂ (&sub;) · ⋑ (&Sup;)

Prefer &Sub; in HTML markup (capital S; also aliased as &Subset;). You can also type ⋐ in UTF-8, or use numeric forms when needed.

Reference

Quick Reference

One table for every form you will actually use.

Form	Code	Where it goes
Named entity	`&Sub;`	HTML markup (preferred)
Alias name	`&Subset;`	HTML markup (same glyph)
Direct character	`⋐`	HTML text (UTF-8)
Hex entity	`⋐`	HTML markup
Decimal entity	`⋐`	HTML markup
CSS escape	`\22D0`	Stylesheet `content`
Ordinary subset (related)	`⊂` (⊂, U+2282)	Standard subset relation

When to Use Which

Situation	Use
Double subset relation	`&Sub;` or type `⋐`
Ordinary subset	⊂ / `⊂`
Double superset	⋑ / `&Sup;`
Ordinary superset	⊃ / `⊃`
Generated text via `::before` / `::after`	`content: "\22D0"`

See it

Live Preview

Double subset rendered alone and compared with related set operators.

Example A ⋐ B

Large glyph ⋐

Compared ⋐ ⊂ ⋑ ⊃

With entities Named: ⋐ | Hex: ⋐ | Decimal: ⋐

Code

Complete HTML Example

One page that shows Double Subset with named, hex, decimal, CSS escape, and a typed character. Use View Output or open the live editor.

Named + Hex + Decimal + CSS + Typed

Five ways to produce ⋐, plus a comparison with ordinary ⊂.

html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Double Subset (⋐) in HTML</title>
  <style>
    #point::after {
      content: "\22D0";
    }
  </style>
</head>
<body>
  <p>Double Subset using Named Entity: &Sub;</p>
  <p>Double Subset using Hex Code: &#x22D0;</p>
  <p>Double Subset using HTML Code: &#8912;</p>
  <p id="point">Double Subset using CSS Entity: </p>
  <p>Typed directly: ⋐</p>
  <p>Compared: A &Sub; B vs A &sub; B</p>
</body>
</html>

Try It Yourself

How It Works

1. Named: &Sub; is the HTML5 name for U+22D0 → ⋐. Best default in markup (capital S; also &Subset;).

2. Hex: U+22D0 → ⋐ in HTML. Same glyph as the named form.

3. Decimal: same code point as 8912 → ⋐. Same result as hex and named.

4. CSS: use \22D0 in content (not an HTML entity). #point::after appends that ⋐ after the paragraph text.

5. Typed / compared: paste ⋐ in UTF-8, or write A &Sub; B vs A ⊂ B to contrast double and ordinary subset.

Pitfalls & Tips

Common mistakes when working with Double Subset.

Case

Capital S matters

&Sub; is double subset (⋐). ⊂ is ordinary subset (⊂). The names are case-sensitive.

⊂

Not ordinary subset

For everyday set inclusion, prefer ⊂. Use &Sub; only when you specifically need the double-subset glyph.

⋑

Pair with &Sup;

The matching opposite relation is double superset &Sup; (U+22D1).

Alias

Longer name works too

&Subset; is an HTML5 alias for the same character as &Sub;. Prefer the short form in everyday markup.

CSS vs HTML

Do not mix escapes

\22D0 belongs in CSS strings. &Sub; / ⋐ / ⋐ belong in HTML.

Fonts

Math font coverage

Some fonts omit less-common Mathematical Operators. Prefer a math-capable font for reliable display of ⋐.

Semicolon

End named entities

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

Compatibility

Browser Support

Double subset (U+22D0) and its entity forms (&Sub;, ⋐, ⋐, CSS \\22D0) are supported in all mainstream browsers. Visible glyphs depend on math / operator font coverage.

✓ Universal support

Double Subset (⋐)

Encode with named, hex, decimal, CSS escape, or type the character — same code point everywhere encoding is supported.

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+22D0 / entities Full support

Bottom line: Prefer &Sub; in HTML. Use ⋐ / ⋐ when numeric form is required, and \\22D0 only inside CSS content.

Remember

Key Takeaways

Unicode: double subset is U+22D0 (decimal 8912) — glyph ⋐.
HTML: prefer &Sub; — also ⋐ / ⋐ / type ⋐.
CSS: use \22D0 inside content for generated text.
Meaning: ⋐ = double subset — not ⊂, not &Sup;.

One line: U+22D0 → &Sub; / ⋐ / ⋐ / CSS \22D0.

Frequently Asked Questions

How do I display ⋐ in HTML?

Use &Sub; (named), ⋐ (hex), ⋐ (decimal), type ⋐ directly in UTF-8, or the CSS escape \22D0 in content. Prefer &Sub; in normal HTML.

What is the Unicode value for this mark?

U+22D0 (DOUBLE SUBSET). Hex 22D0, decimal 8912. It belongs to the Mathematical Operators block (U+2200–U+22FF).

Is there a named HTML entity for U+22D0?

Yes. Use &Sub; (capital S) or the alias &Subset;. Numeric forms ⋐ and ⋐ also work. Do not use ⊂ — that is ordinary subset U+2282.

When should I use U+22D0?

Use it in set-theory or math text when you need the double-subset relation ⋐. Prefer ⊂ for ordinary subset ⊂, and &Sup; for double superset ⋑.

What is the difference between HTML code and CSS entity for U+22D0?

HTML entities (&Sub;, ⋐, or ⋐) go in markup. The CSS escape \22D0 goes in stylesheet strings (usually content on ::before/::after).

Is &Sub; the same as ⊂ or &Subset;?

&Sub; and &Subset; both decode to ⋐ (U+22D0). ⊂ is ⊂ (U+2282) — a different character. Entity names are case-sensitive.

Did you know?

Double subset is Unicode U+22D0 (decimal 8912) — glyph ⋐ in the Mathematical Operators block. HTML5 names it &Sub; (also &Subset;). Ordinary subset is ⊂ (U+2282). The matching double-superset is &Sup; (U+22D1).

Next: Double Superset

Learn the HTML entity for double superset (U+22D1).

Double Superset tutorial →

About the author

Mari Selvan M P 🔗

Developer, cloud engineer, and technical writer

Experience 12 years building web and cloud systems
Focus Full Stack Development, AWS, and Developer Education

I write practical tutorials so students and working developers can learn by doing—from databases and APIs to deployment on AWS.

AWS Certified Developer – Associate (Credly)

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