Contains As Member

Contains As Member at U+220B is a mathematical relation symbol meaning “has as an element” or “contains the following member.” It sits in the Mathematical Operators block and is essentially the reversed counterpart of the familiar “is an element of” sign. Its main use is in set theory and formal mathematics, where a statement such as A ∋ x says that the set A contains x. This is logically the same as writing x ∈ A, but it places the set first, which can be useful when the surrounding sentence or formula is organized around the set. The symbol also appears in logic, type theory, and specification writing when authors want membership relations to read left to right from a container, collection, class, or domain toward an item. In ordinary teaching material it is less common than ∈, so many textbooks prefer the element-first form unless the reversed order improves clarity. A practical point is that ∋ is visually close to related symbols such as reversed epsilon forms used in other mathematical roles, so its meaning depends heavily on mathematical context and spacing.