HTML Entity for Double Union (⋓)
What You'll Learn
How to display the Double Union (⋓) in HTML using hexadecimal, decimal, the named entity ⋓, and CSS escape methods. This character is U+22D3 (DOUBLE UNION) in the Mathematical Operators block (U+2200–U+22FF)—used in set theory to denote a double union relation (e.g. A ⋓ B).
Render it with ⋓, ⋓, ⋓, or CSS escape \22D3. For single union use ∪ (∪, U+222A); for double intersection use ⋒ (⋒, U+22D2). See also math entities.
⚡ Quick Reference — Double Union
U+22D3Mathematical Operators block
⋓Hexadecimal reference
⋓Decimal reference
⋓HTML5 named entity for U+22D3
Name Value
──────────── ──────────
Unicode U+22D3
Hex code ⋓
HTML code ⋓
Named entity ⋓
CSS code \22D3
Related U+222A = Union (∪); U+22D2 = Intersection (⋒)Complete HTML Example
This example demonstrates the Double Union (⋓) using hexadecimal code, decimal HTML code, the named entity ⋓, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\22D3";
}
</style>
</head>
<body>
<p>Double Union using Hexadecimal: ⋓</p>
<p>Double Union using HTML Code: ⋓</p>
<p>Double Union using HTML Entity: ⋓</p>
<p id="point">Double Union using CSS Entity: </p>
</body>
</html>🌐 Browser Support
U+22D3 is widely supported in modern browsers when rendered with a font that includes Mathematical Operators:
👀 Live Preview
See the Double Union (⋓) in mathematical notation:
🧠 How It Works
Hexadecimal Code
⋓ uses the Unicode hexadecimal value 22D3 to display the Double Union. The x prefix indicates hexadecimal format.
Decimal HTML Code
⋓ uses the decimal Unicode value 8915 to display the same character.
Named HTML Entity
⋓ is the HTML5 named entity for U+22D3. It is easy to read in source and resolves to the same character (⋓).
CSS Entity
\22D3 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+22D3. Single union: ∪ (∪). Double intersection: ⋒ (⋒, U+22D2).
Use Cases
The Double Union (⋓) commonly appears in:
Mathematical expressions where ⋓ denotes a double union relation between sets (e.g. A ⋓ B in set theory or lattice notation).
Notation for relations and partial orders where the double union 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 union) - Distinguish ⋓ from ⋒ (
⋒, double intersection) - Use
\22D3only inside CSScontent
Don’t
- Confuse
⋓(⋓) with∪(∪, single union) - Use
⋒when you need double intersection ⋒, not ⋓ - Put CSS escape
\22D3in 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
\22D3Unicode U+22D3 DOUBLE UNION
Single ∪: U+222A via ∪ or ∪
Four methods, one glyph — widely supported in modern browsers
❓ Frequently Asked Questions
⋓ (hex), ⋓ (decimal), ⋓ (named entity), or \22D3 in CSS content. All produce ⋓.U+22D3 (DOUBLE UNION). Mathematical Operators block (U+2200–U+22FF). Hex 22D3, decimal 8915. Double union (double cup) in set theory.⋓, ⋓, or ⋓) go in markup. The CSS escape \22D3 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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