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\[NotLeftTriangle]\[NotLeftTriangleEqual]

NotLeftTriangleBar

NotLeftTriangleBar \[NotLeftTriangleBar]

FilledSmallSquare Infix ordering operator.

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

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[NotLeftTriangle] , \[NotLeftTriangleEqual] , \[NotRightTriangleBar] , \[LeftTriangleBar] .

\[NotLeftTriangle]\[NotLeftTriangleEqual]