U+220B "∋" Contains as Member Unicode Character

U+220B "∋" Contains as Member is a mathematical symbol used to denote set membership from the right side, indicating that something on the left of the symbol contains an element or set on the right. It is the converse relationship to the "Element Of" symbol (∈), so while "a ∈ B" means "a is an element of B," the "∋" symbol in an expression like "B ∋ a" means "B contains a as a member." This symbol is commonly found in set theory, logic, and advanced mathematics to clearly express inclusion relations in either direction within formulas and proofs.