HTML Entity for Not Subset Of (⊄)
What You'll Learn
How to display the Not Subset Of symbol (⊄) in HTML using named, hexadecimal, decimal, and CSS escape methods. This set-theory operator states that one set is not a proper subset of another (e.g. A ⊄ B means A is not contained in B).
This character is U+2284 (NOT A SUBSET OF) in the Mathematical Operators block (U+2200–U+22FF). Render it with the named entity ⊄, ⊄, ⊄, or CSS escape \2284. Compare with Neither A Subset Nor Equal To (⊈) and Not A Superset Of (⊅, ⊅).
⚡ Quick Reference — Not Subset Of
U+2284Mathematical Operators
⊄Hexadecimal reference
⊄Decimal reference
⊄HTML5 named entity for U+2284
Name Value
──────────── ──────────
Unicode U+2284
Hex code ⊄
HTML code ⊄
Named entity ⊄
CSS code \2284
Meaning Not a subset of (strict)
Related U+2282 = subset of (⊂, ⊂)
U+2286 = subset of or equal (⊆, ⊆)
U+2288 = neither subset nor equal (⊈)
U+2285 = not a superset of (⊅, ⊅)
Block Mathematical Operators (U+2200–U+22FF)Complete HTML Example
A simple example showing ⊄ using hexadecimal code, decimal HTML code, the named entity, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point::after{
content: "\2284";
}
</style>
</head>
<body>
<p>Symbol (hex): ⊄</p>
<p>Symbol (decimal): ⊄</p>
<p>Symbol (named): ⊄</p>
<p id="point">Symbol (CSS): </p>
</body>
</html>🌐 Browser Support
U+2284 is widely supported wherever Unicode Mathematical Operators render correctly:
👀 Live Preview
See ⊄ in set theory and mathematical relation contexts:
🧠 How It Works
Named Entity
⊄ is the HTML named entity for U+2284—the most readable choice when writing set-theory markup.
Hexadecimal Code
⊄ uses the Unicode hexadecimal value 2284 to display the not-subset symbol.
Decimal HTML Code
⊄ uses the decimal Unicode value 8836 to display the same character.
CSS Entity
\2284 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+2284 in Mathematical Operators (U+2200–U+22FF).
Use Cases
The ⊄ symbol (⊄) is commonly used in:
Stating that one set is not contained within another.
Textbooks, papers, and lecture notes on sets and relations.
Formal arguments showing containment does not hold.
Discrete math and algorithms courses with web-based notation.
Interactive set-theory modules and quizzes.
Unicode charts and HTML entity documentation for math symbols.
💡 Best Practices
Do
- Use
⊄for readable set-theory markup - Distinguish ⊄ (not subset) from ⊈ (neither subset nor equal) and ⊆ (subset or equal)
- Pair ⊄ with plain-language description on first use
- Use numeric references in generated or XML-first workflows
- Serve pages with UTF-8 (
<meta charset="utf-8">)
Don’t
- Confuse ⊄ (
⊄) with ⊅ (⊅, not superset) - Confuse
⊄with∉(∉, not element of) - Use padded Unicode notation like U+02284—the correct value is
U+2284 - Put CSS escape
\2284in HTML text nodes - Use
\02284in CSS—the correct escape is\2284
Key Takeaways
Three HTML references plus CSS all render ⊄
⊄ ⊄ ⊄For CSS stylesheets, use the escape in the content property
\2284Unicode U+2284 — NOT A SUBSET OF
Mathematical Operators block (U+2200–U+22FF)
⊄ is the preferred named entity for readable source markup
❓ Frequently Asked Questions
⊄ (named), ⊄ (hex), ⊄ (decimal), or \2284 in CSS content. All produce ⊄.U+2284 (NOT A SUBSET OF). Mathematical Operators block (U+2200–U+22FF). Hex 2284, decimal 8836. Named entity: ⊄.⊄, ⊄, or ⊄) go directly in markup. The CSS escape \2284 is used in stylesheets, typically in the content property of pseudo-elements. Same visual result, different layers of the stack.⊄ is the named HTML entity for U+2284 and is the most readable option in set-theory markup.Explore More HTML Entities!
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