DefaultOptions is a style option that allows default options to be specified for particular formatting and related constructs.
DelimiterMatching is an option for selections that specifies whether an opening delimiter will match only its respective closing delimiter or any closing delimiter.
Delimiter represents a delimiter to be displayed in objects such as PopupMenu and Manipulate.
DialogSymbols is an option for Dialog which gives a list of symbols whose values should be localized in the dialog.
DifferentialRootReduce[expr, x] attempts to reduce expr to a single DifferentialRoot object as a function of x.DifferentialRootReduce[expr, {x, x_0}] takes the initial ...
Disjunction[expr, {a_1, a_2, ...}] gives the disjunction of expr over all choices of the Boolean variables a_i.
DisplayEndPacket[] is a MathLink packet that indicates the end of a series of expressions relating to a postscript graphic.
DisplayPacket[] is a MathLink packet that indicates the beginning of a series of expressions related to a PostScript graphic.
ExtentSize is an option to DiscretePlot and DiscretePlot3D that specifies how far to extend out from each plot point.
FileNameDialogSettings -> {opt -> val} is a global option that specifies settings for the Insert File Path dialog box.