Not An Element Of

July 28, 2025

∉

Click the symbol above to copy

U+2209 | Categories: other

If you see '□', please refer to fix missing characters ascii art for a solution.

Technical Information

Unicode:U+2209

HTML Code:∉

CSS Code:"\2209"

HTML Entity:&NotElement;

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A ∉ B
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Not An Element Of Content

Not An Element Of Symbol (∉)

The **"Not An Element Of" symbol (∉)** is a fundamental mathematical operator used in set theory. It consists of the "element of" symbol (∈) with a diagonal slash through it, indicating that an object is *not* a member of a given set. This symbol is crucial for accurately expressing relationships within mathematical sets and is widely used in various branches of mathematics, logic, and computer science.

How to Use the Not An Element Of Symbol

You can easily copy and paste the Not An Element Of symbol: ∉

On Windows:

Hold down the Alt key and type 8713 on the numeric keypad (ensure Num Lock is on). Alternatively, use the Character Map (Charmap.exe) and search for "Not An Element Of" or navigate to the "Mathematical Operators" block.

On Mac:

Use the Character Viewer (Edit > Emoji & Symbols). Search for "not element of" or "math symbol."

On Mobile (iOS/Android):

This character is generally not found on standard mobile keyboards. You would typically need to use a specialized mathematical keyboard app or a character lookup tool to insert it.

Technical Information for Developers

For web developers and designers, understanding the various codes for the Not An Element Of symbol is essential for proper implementation, especially when rendering mathematical equations or logical expressions.

HTML Entities:

<!-- HTML Decimal Code --> ∉

<!-- HTML Hexadecimal Code --> ∉

<!-- HTML Named Entity --> &NotElement;

CSS Content Property:

.not-an-element-of::before { content: "\2209"; }

Unicode Details:

Unicode: U+2209
Name: NOT AN ELEMENT OF
Block: Mathematical Operators, U+2200 - U+22FF
Plane: Basic Multilingual Plane, U+0000 - U+FFFF
Script: Code for undetermined script (Zyyy)
Category: Math Symbol (Sm)
Bidirectional Class: Other Neutral (ON)
Combining Class: Not Reordered (0)
Character is Mirrored: Yes (Mirrored by ∌ U+220C)
Unicode Version: 1.1 (June 1993)

Encoding:

UTF-8 Encoding: 0xE2 0x88 0x89
UTF-16 Encoding: 0x2209
UTF-32 Encoding: 0x00002209