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based on an earlier version of the Wolfram Language.
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\[DownArrow]\[DownArrowUpArrow]

DownArrowBar

DownArrowBar \[DownArrowBar]

FilledSmallSquare Infix arrow operator.

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

FilledSmallSquare Sometimes used as an indicator of depth.

FilledSmallSquare Extensible character.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[DownTeeArrow] , \[DownArrow] , \[LeftDownVectorBar] , \[UpArrowBar] .

\[DownArrow]\[DownArrowUpArrow]