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FilledSmallSquareTagBox[boxes, tag] displays as boxes but maintains tag to guide the interpretation of boxes on input.

FilledSmallSquareTagBox provides a way to store hidden information in Mathematica output.

FilledSmallSquareTagBox is generated sometimes in StandardForm output, and often in TraditionalForm output.

FilledSmallSquare By convention, tag is typically a symbol that corresponds to the head of the interpreted form of boxes.

FilledSmallSquare The following options can be given:

FilledSmallSquare If you modify the displayed form of TagBox[boxes, tag] only boxes will be modified, and there is no guarantee that correct correspondence with expr will be maintained.

FilledSmallSquare See The Mathematica Book: Section 2.8.10.

FilledSmallSquare See also: InterpretationBox, FormBox, ToExpression.