Does not contain as member (∌) is the Unicode character at U+220C in the Mathematical Operators block. Official name: DOES NOT CONTAIN AS MEMBER. In set theory, S ∌ x means S does not contain x as a member.
Remember
Character ∌
Unicode U+220C
Named entity ∌
Hex entity ∌
Decimal ∌
CSS escape \220C
Not the same ∋ · ∉ · ∈
Prefer ∌ in HTML markup (aliases: ∌, ∌). You can also type ∌ in UTF-8, or use numeric forms when needed.
Does not contain as member rendered in common set-theory contexts.
ExampleS ∌ x
Large glyph∌
Compared∋ ∌ ∈ ∉
With entitiesNamed: ∌ | Hex: ∌ | Decimal: ∌
Code
Complete HTML Example
One page that shows Does Not Contain As Member with named, hex, decimal, CSS escape, and a typed character. Use View Output or open the live editor.
Named + Hex + Decimal + CSS + Typed
Five ways to produce ∌, plus a set-theory example.
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Does Not Contain As Member (∌) in HTML</title>
<style>
#point::after {
content: "\220C";
}
</style>
</head>
<body>
<p>Symbol using Named Entity: ∌</p>
<p>Symbol using Hex Code: ∌</p>
<p>Symbol using HTML Code: ∌</p>
<p id="point">Symbol using CSS Entity: </p>
<p>Typed directly: ∌</p>
<p>Example: S ∌ x means S does not contain x. Positive uses ∋.</p>
</body>
</html>
Symbol using Named Entity: ∌
Symbol using Hex Code: ∌
Symbol using HTML Code: ∌
Symbol using CSS Entity: ∌
Typed directly: ∌
Example: S ∌ x means S does not contain x. Positive uses ∋.
How It Works
1. Named:∌ is the HTML5 name for U+220C → ∌. Best default in markup.
2. Hex:U+220C → ∌ in HTML. Same glyph as the named form.
3. Decimal: same code point as 8716 → ∌. Same result as hex and named.
4. CSS: use \220C in content (not an HTML entity). #point::after appends that ∌ after the paragraph text.
5. Typed / example: paste ∌ in UTF-8, or write S ∌ x. The positive form is ∋ (∋).
Pitfalls & Tips
Common mistakes when working with Does Not Contain As Member.
∉
Not the same as ∉
∉ (∉) means x is not an element of S. ∌ (∌) means S does not contain x.
∋
Positive relation
Do not use ∌ when you mean contains as member — that is ∋ (∋).
Name
Watch notni vs notin
∌ is U+220C. ∉ is U+2209. Easy to swap in markup.
CSS vs HTML
Do not mix escapes
\220C belongs in CSS strings. ∌ / ∌ / ∌ belong in HTML.
Fonts
Math font coverage
Some fonts omit U+220C. Prefer a font with Mathematical Operators coverage for display.
Semicolon
End references
Always finish with ; — write ∌, not ¬ni.
Compatibility
Browser Support
Does not contain as member (U+220C) and its entity forms (∌, ∌, ∌, CSS \\220C) are supported in all mainstream browsers. Visible glyphs depend on math font coverage.
✓ Universal support
Does Not Contain As Member (∌)
Encode with named, hex, decimal, CSS escape, or type the character — same code point everywhere encoding is supported.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+220C / entitiesFull support
Bottom line: Prefer ∌ in HTML. Use ∌ or ∌ when numeric form is required, and \\220C only inside CSS content.
Remember
Key Takeaways
Unicode: does not contain as member is U+220C (decimal 8716) — glyph ∌.
HTML: prefer ∌, or use ∌ / ∌ / type ∌.
CSS: use \220C inside content for generated text.
Meaning:∌ = set does not contain — not ∉ (not element of) or ∋ (contains).
One line:U+220C → ∌ / ∌ / ∌ / CSS \220C / type ∌.
Frequently Asked Questions
Use ∌ (named), ∌ (hex), ∌ (decimal), type ∌ directly in UTF-8, or the CSS escape \220C in content. Prefer ∌ in normal HTML.
U+220C (DOES NOT CONTAIN AS MEMBER). Hex 220C, decimal 8716. It belongs to the Mathematical Operators block (U+2200–U+22FF).
Yes. Use ∌ (preferred). Aliases include ∌ and ∌. Numeric forms ∌ and ∌ also work.
Use it in set theory when a set does not contain an element as a member (S ∌ x). For “x is not an element of S”, use U+2209 (∉).
HTML entities (∌, ∌, or ∌) go in markup. The CSS escape \220C goes in stylesheet strings (usually content on ::before/::after).
No. ∌ (∌) means does not contain as member. ∋ (∋) is the positive contains-as-member. ∉ (∉) means not an element of.
🤔
Did you know?
Does not contain as member is Unicode U+220C (decimal 8716) — glyph ∌ in the Mathematical Operators block. HTML5 names it ∌ (also ∌, ∌). It is the negation of contains-as-member ∋ (∋). Do not confuse with not-an-element-of ∉ (∉).
