U+2285 • mathematics
The 'Not a Superset Of' symbol (⊅) indicates that one set is not a superset of another, negating the inclusion relation. It is used in set theory to express that the superset relation does not hold.
The Symbol For Not a Superset 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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