U+2209 • set-theory
The not an element of symbol (∉) used in set theory and mathematics to indicate that an object is not a member of a specified set. It negates the membership relation between an element and a set.
The Symbol For Not an Element Of (∉) is a unicode character in the Basic Multilingual Plane Plane. It is found in the Mathematical Operators block and was approved as part of Unicode Version 1.1 in 1993
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