U+228A "⊊" Subset of with Not Equal To Unicode Character

U+228A "⊊" Subset of with Not Equal To is a mathematical symbol that combines the concept of a proper subset with the explicit notation of inequality, indicating that one set is contained within another set but is not equal to it. It is typically used in set theory and advanced mathematics to denote a subset relationship where the first set is strictly smaller than the second, distinguishing it from the regular subset symbol (⊆) which allows for the possibility of equality. This symbol helps clarify precise logical and mathematical statements, particularly in proofs and definitions where the exclusion of equality is critical to the argument.