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LeftArrowRightArrow \[LeftArrowRightArrow]

FilledSmallSquare Infix arrow operator.

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

FilledSmallSquare Used in mathematics to indicate logical equivalence.

FilledSmallSquare Sometimes used to indicate chemical equilibrium.

FilledSmallSquare Extensible character.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[RightArrowLeftArrow] , \[LeftRightArrow] , \[DoubleLeftRightArrow] , \[Equilibrium] , \[UpArrowDownArrow] .