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\[DoubleUpArrow]\[DoubleVerticalBar]

DoubleUpDownArrow

DoubleUpDownArrow \[DoubleUpDownArrow]

FilledSmallSquare Infix arrow operator.

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

FilledSmallSquare Extensible character.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[UpDownArrow] , \[UpArrowDownArrow] , \[DownArrowUpArrow] .

\[DoubleUpArrow]\[DoubleVerticalBar]