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\[DoubleLeftRightArrow]\[DoubleLongLeftArrow]

DoubleLeftTee

DoubleLeftTee \[DoubleLeftTee]

FilledSmallSquare Infix operator.

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

FilledSmallSquarex y z groups as (x y) z.

FilledSmallSquare Used in mathematics to indicate various strong forms of logical implication of x from y—often tautological implication.

FilledSmallSquare See The Mathematica Book: Section 3.10.4 and Section 3.10.4.

FilledSmallSquare See also: \[LeftTee] , \[DoubleRightTee] .

\[DoubleLeftRightArrow]\[DoubleLongLeftArrow]