x y is by default interpreted as SquareUnion[x, y].
Used in mathematics to denote various forms of generalized union, typically of disjoint subspaces.
See The Mathematica Book: Section 3.10.4.
See also: \[SquareIntersection] , \[Union] , \[UnionPlus] , \[Vee] , \[Coproduct] .
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