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based on an earlier version of the Wolfram Language.
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\[EmptyDiamond]\[EmptyRectangle]

EmptyDownTriangle

EmptyDownTriangle \[EmptyDownTriangle]

FilledSmallSquare Letter-like form.

FilledSmallSquare Not the same as \[Del].

FilledSmallSquare See The Mathematica Book: Section 3.10.3.

FilledSmallSquare See also: \[EmptyUpTriangle] , \[FilledDownTriangle] , \[FilledUpTriangle] , \[LeftTriangle] , \[NotLeftTriangle] , \[NotRightTriangle] , \[RightTriangle] .

\[EmptyDiamond]\[EmptyRectangle]