Not An Element Of Symbol
∉ means “not an element of,” stating that an item does not belong to a set.
U+2209
The symbol ∉ is a standard mathematical notation used to describe membership. It’s often read as “not an element of” when working with sets and logic. You can copy it directly or use its Unicode value U+2209.
Not An Element Of Symbol Meaning
∉ (Unicode U+2209) is pronounced “not an element of.” It is used to state that a particular item is not a member of a set, often in set theory and logic. For example, you might write that x ∉ A to indicate x is not contained in set A. The symbol is also commonly paired with the related “element of” symbol (∈) when contrasting membership vs. non-membership. In documents, it helps communicate restrictions clearly, especially in textbooks, proofs, and formulas where set membership is essential.
Common uses
- •Writing set membership rules, such as x ∉ A
- •Expressing constraints in math problems and solutions
- •Indicating exclusion in formal definitions and logic statements
- •Labeling conditions in exercises, proofs, and worksheets
- •Building clear notation in educational and technical documents
Examples
∉ Not an Element of Symbol (U+2209)
- ∉x ∉ A
- ∉3 ∉ B
- ∉y ∉ S
- ∉z ∉ {1,2,3}
- ∉t ∉ U
Variations
Ready to copy
Technical codes
| Unicode | U+2209 | |
| HTML Entity | ∉ | |
| HTML Code | ∉ | |
| CSS | \2209 | |
| Alt Code | Alt + 8713 | |
| Decimal | 8713 |
How to type Not An Element Of Symbol (∉)
On Windows
Hold Alt and type 8713 on the numeric keypad. In Word, type 2209 then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 2209. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 2209, then press Enter or Space.
Anywhere
Copy ∉ with the button above and paste it wherever you need it — this works on every device and in every app, with no keyboard shortcut to remember.
FAQ
What does ∉ mean?
∉ means “not an element of,” used to say that something is not a member of a set.
How do I write ∉ using Unicode?
The Unicode code point is U+2209. You can use the HTML entity ∉.
Is ∉ the opposite of ∈?
Yes. ∈ means “an element of,” while ∉ indicates non-membership in the set.
Where is ∉ commonly used?
It’s most commonly seen in set theory, proofs, and formal logic or math documents that describe membership.