U+228A • mathematics
The symbol '⊊' (Subset of with Not Equal To) denotes that one set is a proper subset of another, meaning it is contained within but not equal to the other set. It is used in set theory to express strict subset relations.
The Symbol For Subset of with Not Equal To (⊊) 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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