∌

Math Operator 13

Unicode
U+220C
Category
Math
HTML Entity
∌
CSS
\220C
The "Does Not Contain As Member" symbol (∌) is a mathematical operator used in set theory to indicate that a set does not include a specific element. It serves as the exact opposite of the "Contains As Member" symbol (∋) and the reversed counterpart to the "Not An Element Of" symbol (∉). While you won't see it much in casual text messages, it's an essential character for writing precise mathematical proofs and logic equations.

How to Type

Windows
Win + . to open Emoji Panel, select Symbols, or type 220C then Alt+X in MS Word
macOS
Control + Command + Space then search "does not contain"
Linux
Ctrl + Shift + U then type 220c and press Enter
HTML
∌ or ∌

In Programming

In mathematical typesetting languages like LaTeX, this symbol is generated using the command `\not\ni` or `\notowns`. In everyday programming, the symbol is rarely used directly; instead, functions like `!set.contains(x)` or `x not in set` handle the same logic.

Read full meaning article

Tags

A does not contain b crossed contains does not contain exclusion mathematics negated contains symbol not contains as member not member reversed not element set non-inclusion set theory set theory negation ∌ meaning

Related Symbols

± Plus Minus Sign × Multiplication Sign ÷ Division Sign ≠ Not Equal To ≈ Approximately Equal To ∞ Infinity √ Square Root ∑ Summation ∫ Integral π Pi ≤ Less Than or Equal To ≥ Greater Than or Equal To