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FilledSmallSquareDisplayForm[expr] prints with boxes inside expr shown in explicit two-dimensional or other form.

FilledSmallSquare In ordinary StandardForm output, boxes such as SubscriptBox are shown literally. In DisplayForm they are shown as explicit two-dimensional constructs.

FilledSmallSquare Example: DisplayForm[SubscriptBox["x", "y"]] LongRightArrow.

FilledSmallSquareDisplayForm acts as a "wrapper", which affects printing, but not evaluation.

FilledSmallSquare See The Mathematica Book: Section 2.8.10.

FilledSmallSquare See also: FullForm, ToExpression, ToBoxes.

Further Examples