HTML Entity for Double Superset (⋑)
What You'll Learn
How to display the Double Superset (⋑) in HTML using hexadecimal, decimal, the named entity ⋑, and CSS escape methods. This character is U+22D1 (DOUBLE SUPERSET) in the Mathematical Operators block (U+2200–U+22FF)—used in set theory to denote a double superset relation (e.g. A ⋑ B).
Render it with ⋑, ⋑, ⋑, or CSS escape \22D1. For single superset use ⊃ (⊃, U+2283); for double subset use ⋐ (⋐, U+22D0). See also math entities.
⚡ Quick Reference — Double Superset
U+22D1Mathematical Operators block
⋑Hexadecimal reference
⋑Decimal reference
⋑HTML5 named entity for U+22D1
Name Value
──────────── ──────────
Unicode U+22D1
Hex code ⋑
HTML code ⋑
Named entity ⋑
CSS code \22D1
Related U+2283 = Superset (⊃); U+22D0 = Subset (⋐)Complete HTML Example
This example demonstrates the Double Superset (⋑) using hexadecimal code, decimal HTML code, the named entity ⋑, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\22D1";
}
</style>
</head>
<body>
<p>Double Superset using Hexadecimal: ⋑</p>
<p>Double Superset using HTML Code: ⋑</p>
<p>Double Superset using HTML Entity: ⋑</p>
<p id="point">Double Superset using CSS Entity: </p>
</body>
</html>🌐 Browser Support
U+22D1 is widely supported in modern browsers when rendered with a font that includes Mathematical Operators:
👀 Live Preview
See the Double Superset (⋑) in mathematical notation:
🧠 How It Works
Hexadecimal Code
⋑ uses the Unicode hexadecimal value 22D1 to display the Double Superset. The x prefix indicates hexadecimal format.
Decimal HTML Code
⋑ uses the decimal Unicode value 8913 to display the same character.
Named HTML Entity
⋑ is the HTML5 named entity for U+22D1. It is easy to read in source and resolves to the same character (⋑).
CSS Entity
\22D1 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+22D1. Single superset: ⊃ (⊃). Double subset: ⋐ (⋐, U+22D0).
Use Cases
The Double Superset (⋑) commonly appears in:
Mathematical expressions where ⋑ denotes a double superset relation between sets (e.g. A ⋑ B in order theory or set containment).
Notation for relations and partial orders where the double superset 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 superset) - Distinguish ⋑ from ⋐ (
⋐, double subset) - Use
\22D1only inside CSScontent
Don’t
- Confuse
⋑(⋑) with⊃(⊃, single superset) - Use
⋐when you need double subset ⋐, not ⋑ - Put CSS escape
\22D1in 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
\22D1Unicode U+22D1 DOUBLE SUPERSET
Single ⊃: U+2283 via ⊃ or ⊃
Four methods, one glyph — widely supported in modern browsers
❓ Frequently Asked Questions
⋑ (hex), ⋑ (decimal), ⋑ (named entity), or \22D1 in CSS content. All produce ⋑.U+22D1 (DOUBLE SUPERSET). Mathematical Operators block (U+2200–U+22FF). Hex 22D1, decimal 8913. Double superset relation in set theory.⋑, ⋑, or ⋑) go in markup. The CSS escape \22D1 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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