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\[DoubleStruckZero] ... \[DoubleStruckNine]\[DoubleUpDownArrow]

DoubleUpArrow

DoubleUpArrow \[DoubleUpArrow]

FilledSmallSquare Infix arrow operator.

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

FilledSmallSquare Extensible character.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[UpArrow] , \[DoubleDownArrow] .

\[DoubleStruckZero] ... \[DoubleStruckNine]\[DoubleUpDownArrow]