HTML Entity for Does Not Contain As Member (∌)
What You'll Learn
How to display the Does Not Contain As Member symbol (∌) in HTML using named, hexadecimal, decimal, and CSS entity methods. This character is U+220C (DOES NOT CONTAIN AS MEMBER) in the Mathematical Operators block (U+2200–U+22FF) and denotes that a set does not contain an element as a member—the negation of “contains as member” (∋, ∋).
Render it with the named entity ∌, ∌, ∌, or CSS escape \220C. Do not confuse with ∉ (∉, not an element of) or group-theory symbols like ⋫.
⚡ Quick Reference — Does Not Contain As Member
U+220CMathematical Operators block
∌Hexadecimal reference
∌Decimal reference
∌Most readable option
Name Value
──────────── ──────────
Unicode U+220C
Hex code ∌
HTML code ∌
Named entity ∌
CSS code \220CComplete HTML Example
This example demonstrates the symbol (∌) using hexadecimal code, decimal HTML code, the named entity, and a CSS content escape on a pseudo-element:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\220C";
}
</style>
</head>
<body>
<p>Using Hexadecimal: ∌</p>
<p>Using HTML Code: ∌</p>
<p>Using Named Entity: ∌</p>
<p id="point">Using CSS Entity: </p>
</body>
</html>🌐 Browser Support
U+220C is supported in modern browsers; use a font with Mathematical Operators coverage for consistent glyphs:
👀 Live Preview
See the Does Not Contain As Member symbol (∌) in set-theory notation:
🧠 How It Works
Named Entity
∌ is the HTML named entity for Does Not Contain As Member — readable and widely used in set-theory markup.
Hexadecimal Code
∌ uses the Unicode hexadecimal value 220C. The x prefix indicates hexadecimal format.
Decimal HTML Code
∌ uses the decimal Unicode value 8716 to display the same character.
CSS Entity
\220C 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+220C negates contains-as-member (∋, ∋). For element-of style, use ∉ (∉) where appropriate.
Use Cases
The symbol (∌) commonly appears in the following scenarios:
When S ∌ x means set S does not contain x as a member.
Papers and textbooks using membership relations with correct Unicode.
Courses teaching ∈, ∉, ∋, and ∌ notation.
Formal logic and computer science set-theory content.
Web math notation needing the proper does-not-contain glyph.
HTML entity references for education and research.
💡 Best Practices
Do
- Use
∌for readable HTML source - Pair ∌ with
∋(∋) when teaching negations - Use fonts that cover Mathematical Operators (U+2200–U+22FF)
- Match your notation convention (∌ vs ∉)
- Pick one entity style per project for consistency
Don’t
- Confuse ∌ (
∌) with ∉ (∉) without checking convention - Swap
∌and∋(different meanings) - Use CSS escape
\220Cinside HTML markup - Mix hex, decimal, and named styles randomly in one file
- Rely on the symbol alone without accessible description
Key Takeaways
Three HTML references all render ∌
∌ ∌ ∌For CSS stylesheets, use the escape in the content property
\220CUnicode U+220C is DOES NOT CONTAIN AS MEMBER in set theory
Negation of ∋ contains-as-member (∋)
Next: Does Not Divide
❓ Frequently Asked Questions
∌ (named), ∌ (hex), ∌ (decimal), or \220C in CSS content. All produce ∌.U+220C (hex 220C, decimal 8716) in the Mathematical Operators block. It means “does not contain as member” (negation of ∋).U+220C, ∌) means does not contain as member. ∋ (U+220B, ∋) means contains as member. They are negations of each other.∌) is does not contain as member (often S ∌ x). ∉ (∉) is not an element of (often x ∉ S). Use the symbol that matches your textbook or notation convention.Explore More HTML Entities!
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