HTML Entity for Double Subset (⋐)
What You'll Learn
How to display the Double Subset (⋐) in HTML using hexadecimal, decimal, the named entity ⋐, and CSS escape methods. This character is U+22D0 (DOUBLE SUBSET) in the Mathematical Operators block (U+2200–U+22FF)—used in set theory to denote a double subset relation (e.g. A ⋐ B).
Render it with ⋐, ⋐, ⋐, or CSS escape \22D0. For single subset use ⊂ (⊂, U+2282); for double superset use ⋑ (⋑, U+22D1). See also math entities.
⚡ Quick Reference — Double Subset
U+22D0Mathematical Operators block
⋐Hexadecimal reference
⋐Decimal reference
⋐HTML5 named entity for U+22D0
Name Value
──────────── ──────────
Unicode U+22D0
Hex code ⋐
HTML code ⋐
Named entity ⋐
CSS code \22D0
Related U+2282 = Subset (⊂); U+22D1 = Superset (⋑)Complete HTML Example
This example demonstrates the Double Subset (⋐) using hexadecimal code, decimal HTML code, the named entity ⋐, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\22D0";
}
</style>
</head>
<body>
<p>Double Subset using Hexadecimal: ⋐</p>
<p>Double Subset using HTML Code: ⋐</p>
<p>Double Subset using HTML Entity: ⋐</p>
<p id="point">Double Subset using CSS Entity: </p>
</body>
</html>🌐 Browser Support
U+22D0 is widely supported in modern browsers when rendered with a font that includes Mathematical Operators:
👀 Live Preview
See the Double Subset (⋐) in mathematical notation:
🧠 How It Works
Hexadecimal Code
⋐ uses the Unicode hexadecimal value 22D0 to display the Double Subset. The x prefix indicates hexadecimal format.
Decimal HTML Code
⋐ uses the decimal Unicode value 8912 to display the same character.
Named HTML Entity
⋐ is the HTML5 named entity for U+22D0. It is easy to read in source and resolves to the same character (⋐).
CSS Entity
\22D0 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+22D0. Single subset: ⊂ (⊂). Double superset: ⋑ (⋑, U+22D1).
Use Cases
The Double Subset (⋐) commonly appears in:
Mathematical expressions where ⋐ denotes a double subset relation between sets (e.g. A ⋐ B in order theory or set containment).
Notation for relations and partial orders where the double subset symbol has a defined meaning.
Textbooks, papers, and course materials requiring letterlike math symbols in HTML.
Equation editors and math rendering that need mathematical operator symbols.
Entity lists and guides for Mathematical Operators (U+2200–U+22FF).
Use math-capable fonts so ⋐ renders clearly for all readers.
💡 Best Practices
Do
- Use
⋐for readable markup, or⋐/⋐ - Use math fonts (Cambria Math, STIX Two Math) for reliable rendering
- Distinguish ⋐ (double) from ⊂ (
⊂, single subset) - Distinguish ⋐ from ⋑ (
⋑, double superset) - Use
\22D0only inside CSScontent
Don’t
- Confuse
⋐(⋐) with⊂(⊂, single subset) - Use
⋑when you need double superset ⋑, not ⋐ - Put CSS escape
\22D0in HTML text nodes - Forget UTF-8 (
<meta charset="utf-8">) on math pages - Assume every font includes Mathematical Operators
Key Takeaways
Named entity available: ⋐
⋐ ⋐For CSS stylesheets, use the escape in the content property
\22D0Unicode U+22D0 DOUBLE SUBSET
Single ⊂: U+2282 via ⊂ or ⊂
Four methods, one glyph — widely supported in modern browsers
❓ Frequently Asked Questions
⋐ (hex), ⋐ (decimal), ⋐ (named entity), or \22D0 in CSS content. All produce ⋐.U+22D0 (DOUBLE SUBSET). Mathematical Operators block (U+2200–U+22FF). Hex 22D0, decimal 8912. Double subset relation in set theory.⋐, ⋐, or ⋐) go in markup. The CSS escape \22D0 is used in stylesheets, typically in the content property of pseudo-elements.⋐ is easier to read in source than ⋐ or ⋐, but all produce ⋐. The named entity is part of the HTML5 entity set for mathematical operators.Explore More HTML Entities!
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