Neither A Subset Of Nor Equal To Symbol
⊈ means “not a subset of” and “not equal to” at the same time.
U+2288
The symbol ⊈ is a logic/mathematics notation that combines two ideas: subset-hood and equality. It’s commonly used in set statements to rule out both “subset” and “equal” cases.
Neither A Subset Of Nor Equal To Symbol Meaning
⊈ stands for “neither a subset of nor equal to.” In set notation, A ⊈ B means you can’t treat A as being contained within B, and it also emphasizes that A is not equal to B. Practically, it’s used when a statement must exclude both possibilities: that A is a subset of B, and that A matches B exactly. This symbol is useful in proofs, formal definitions, and algorithmic or rules-based text where you need unambiguous set comparison language rather than separate statements.
Common uses
- •Set comparisons in math notes (e.g., A ⊈ B to state containment fails).
- •Writing strict checks in logic or specification documents where equality should also be excluded.
- •Clarifying relationships between collections in teaching materials and worksheets.
- •Labeling constraints in diagrams or pseudo-code for formal reasoning.
- •Annotating proof steps to indicate a case is ruled out (“not subset and not equal”).
Examples
⊈ Neither a subset of nor equal to
- ⊈Let A ⊈ B, so A is not contained in B.
- ⊈Since S ⊈ T, S cannot be formed only from elements of T.
- ⊈We verify that X ⊈ Y before applying the next rule.
- ⊈The condition U ⊈ V shows equality is not allowed either.
- ⊈If A ⊈ B, then A is not a subset of B and A ≠ B.
Variations
Ready to copy
Technical codes
| Unicode | U+2288 | |
| HTML Entity | ⊈ | |
| HTML Code | ⊈ | |
| CSS | \2288 | |
| Alt Code | Alt + 8840 | |
| Decimal | 8840 |
How to type Neither A Subset Of Nor Equal To Symbol (⊈)
On Windows
Hold Alt and type 8840 on the numeric keypad. In Word, type 2288 then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 2288. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 2288, 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 in set notation?
⊈ means “neither a subset of nor equal to,” i.e., the set is not a subset and not equal to the other set.
Is ⊈ the same as “not a subset of”?
It’s related, but ⊈ is stronger: it also excludes the equality case, not just subset-hood.
How can I type or paste ⊈ on my device?
You can copy it from this page directly, or use the Unicode code point U+2288 in tools that support Unicode input.
What are the code escapes for ⊈?
HTML entity: ⊈ CSS escape: \\2288 JavaScript (Unicode): \\u{2288}.