U+220C "∌" Does Not Contain as Member Unicode Character

U+220C "∌" Does Not Contain as Member is a mathematical symbol used in set theory and logic to denote that a specific element is not a member of a given set. It represents the negation of the "contains as member" relation, effectively meaning that the object on the left side of the symbol is not an element of the set on the right side. For example, in the expression ( 5 ∌ {1, 2, 3} ), the symbol indicates that 5 is not contained within the set. This character is part of the Mathematical Operators block and is visually distinct from similar symbols like the "element of" (∈) or "not an element of" (∉) by having a slash through a reversed "member" shape.