• Infix operator. • xy is by default interpreted as SquareUnion[x,y]. • Used in mathematics to denote various forms of generalized union, typically of disjoint subspaces. • See also: \[SquareIntersection] , \[Union] , \[UnionPlus] , \[Vee] , \[Coproduct] .
\[SquareUnion]
y is by default interpreted as SquareUnion[x, y]. 