U+2284 • mathematics
The 'Not a Subset Of' symbol (⊄) denotes that one set is not a subset of another, meaning it does not satisfy the inclusion relation. It is used in set theory to express non-inclusion.
The Symbol For Not a Subset 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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