U+2A04 "⨄" N-Ary Union Operator with Plus Unicode Character

U+2A04 "⨄" N-Ary Union Operator with Plus is a mathematical symbol that represents the indexed union of a collection of sets where the union operation also incorporates an addition or summation component, often used in advanced set theory, algebra, or database theory to denote a form of union that preserves or counts multiplicities rather than merging duplicate elements into a single instance. It visually resembles a standard large union symbol (like a big U) but includes a small plus sign embedded within it, signaling that the operation combines sets in a way that maintains additive structure, such as in the context of multisets or operations where each occurrence of an element is significant. This character is part of the Supplemental Arrows-B block in Unicode and is typically employed in mathematical texts to differentiate this specific union-plus operation from the ordinary set union represented by U+22C3 (⋃).