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DownArrowUpArrow \[DownArrowUpArrow]

FilledSmallSquare Infix arrow operator.

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

FilledSmallSquare Extensible character.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[UpDownArrow] , \[DoubleUpDownArrow] , \[UpArrowDownArrow] , \[UpEquilibrium] .