U+228D "⊍" Multiset Multiplication Unicode Character

U+228D "⊍" Multiset Multiplication is a mathematical symbol used in set theory and combinatorics to represent the operation of multiset multiplication, which combines two multisets by multiplying their elements' multiplicities together. Unlike the standard union or addition operators for multisets, this symbol specifically denotes the Cartesian product-like combination where the resulting multiset contains each pair of elements from the two input multisets, with the multiplicity of each pair equal to the product of the multiplicities of the individual elements. It is visually distinct from the similar-looking "⊙" circled dot operator, and its primary use is in formal mathematical notation where precise distinctions between operations on multisets are required.