NOT AN ELEMENT OF
Not an element of, the negated set-membership symbol.
U+2209 · 15.1.0 · Common script
About this character
The symbol U+2209, commonly called “not element of,” is the negated form of the set-membership relation ∈. It denotes that an object does not belong to a set, as in x ∉ A. Originating from Giuseppe Peano’s 1889 notation for membership, the negation slash was later added to express non-membership. In LaTeX, it is produced with \notin; in Unicode, it holds code point U+2209. Beyond mathematics, it appears in logic, computer science, and data modeling to indicate exclusion from a category or collection. Typographically, the diagonal stroke is designed to align with the base glyph, ensuring clarity in both print and digital renderings.
Copy formats
E2 88 892209∉ / ∉\002209\u2209\u2209%E2%88%89Character
Copy the literal character when you need the glyph itself: