U+2289 "⊉" Neither A Superset of nor Equal To Unicode Character

U+2289 "⊉" Neither A Superset of nor Equal To is a mathematical symbol used in set theory to express a specific negative relationship between two sets, indicating that the first set is not a superset of the second set and also is not equal to it. Visually, it resembles the superset symbol "⊇" with a diagonal slash through it, which negates both the superset and equality conditions. This character is part of the Mathematical Operators block and is commonly employed in logical proofs, academic papers, and computer science contexts to denote that a given set fails to contain all elements of another set while also differing in its composition.