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RightTriangle \[RightTriangle]

FilledSmallSquare Infix ordering operator.

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

FilledSmallSquare Used in pure mathematics to mean "contains as a normal subgroup".

FilledSmallSquare See The Mathematica Book: Section 1.10.8 and Section 3.10.4.

FilledSmallSquare See also: \[RightTriangleEqual] , \[RightTriangleBar] , \[RightArrow] , \[NotRightTriangle] , \[LeftTriangle] , \[EmptyUpTriangle] , \[FilledUpTriangle] , \[RightAngle] .