CreatePalette[expr] creates a palette notebook containing expr, and opens it in the front end.CreatePalette[{expr_1, expr_2, ...}] creates and opens a palette notebook ...

DefaultElement is an option for Grid and related constructs which specifies what to insert when a new element is interactively created.

DeletionWarning is an option for InterpretationBox or TagBox objects that specifies whether a warning is issued if the box is deleted.

Dimensions[expr] gives a list of the dimensions of expr. Dimensions[expr, n] gives a list of the dimensions of expr down to level n.

DiscreteTimeModelQ[expr] gives True if expr is a discrete-time StateSpaceModel or TransferFunctionModel object and False otherwise.

DistributionParameterQ[dist] yields True if dist is a valid distribution, and yields False otherwise.

Divisible[n, m] yields True if n is divisible by m, and yields False if it is not.

DocumentNotebook[{cell_1, cell_2, ...}] represents a complete document notebook in the Mathematica front end.

DumpSave["file.mx", symbol] writes definitions associated with a symbol to a file in internal Mathematica format. DumpSave["file.mx", " context`"] writes out definitions ...

EdgeForm[g] is a graphics directive which specifies that edges of polygons and other filled graphics objects are to be drawn using the graphics directive or list of ...