CounterStyleMenuListing is an option for cells that specifies what counter styles are listed in the Counter popup menu of the Create Automatic Numbering Object dialog box.
DefaultNewInlineCellStyle is an option for cells that specifies the default style to use for new inline cells created in the notebook.
DeletionWarning is an option for InterpretationBox or TagBox objects that specifies whether a warning is issued if the box is deleted.
Directory[] gives the current working directory.
Divisors[n] gives a list of the integers that divide n.
DoubleLeftArrow[x, y, ...] displays as x \[DoubleLeftArrow] y \[DoubleLeftArrow] ....
DoubleVerticalBar[x, y, ...] displays as x \[DoubleVerticalBar] y \[DoubleVerticalBar] ....
ErrorBox[boxes] is a low-level box construct that represents boxes that cannot be interpreted in input or output.
EvaluationCompletionAction is an option for notebooks that specifies the action taken when an evaluation is completed.
Expand
(Built-in Mathematica Symbol) Expand[expr] expands out products and positive integer powers in expr. Expand[expr, patt] leaves unexpanded any parts of expr that are free of the pattern patt. >