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SquareSubset \[SquareSubset]

FilledSmallSquare Infix set relation operator.

FilledSmallSquarex y is by default interpreted as SquareSubset[x, y].

FilledSmallSquare Used in computer science to indicate that x is a substring occurring at the beginning of y.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[NotSquareSubset] , \[SquareSuperset] .