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LeftTriangle \[LeftTriangle]

FilledSmallSquare Infix ordering operator.

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

FilledSmallSquare Used in pure mathematics to mean "normal subgroup of".

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[LeftTriangleEqual] , \[LeftTriangleBar] , \[LeftArrow] , \[NotLeftTriangle] , \[RightTriangle] , \[EmptyUpTriangle] , \[FilledUpTriangle] .