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based on an earlier version of the Wolfram Language.
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\[UpArrowBar]\[UpDownArrow]

UpArrowDownArrow

UpArrowDownArrow \[UpArrowDownArrow]

FilledSmallSquare Infix arrow operator.

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

FilledSmallSquare Extensible character.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

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

\[UpArrowBar]\[UpDownArrow]