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  • UnderscriptBox[ x , y ] represents in input and output.
  • Inside \( ... \) UnderscriptBox[ x , y ] can be input as x \+ y.
  • In a notebook a UnderscriptBox can be created using +. moves out of the underscript position.
  • In StandardForm and InputForm, UnderscriptBox[ x , y ] is interpreted on input as Underscript[ x , y ].
  • UnderscriptBox[ x , "_"] is interpreted as UnderBar[ x ] or . The input form x\ &\%- can be used.
  • The baseline of UnderscriptBox[ x , y ] is taken to be the baseline of x.
  • UnderscriptBox[ x , y ] is usually output with y in a smaller font than x.
  • With the option setting LimitsPositioning->True y is placed in an underscript position when the whole UnderscriptBox is displayed large, and in a subscript position when it is displayed smaller.
  • In StandardForm, explicit UnderscriptBox objects are output literally. You can use DisplayForm to see the display form of such objects.
  • See the Mathematica book: Section 2.8.10.
  • See also: OverscriptBox, UnderoverscriptBox, SubscriptBox, GridBox, ScriptSizeMultipliers.