DefaultBoxStyle is a low-level option for three-dimensional graphics functions that specifies the default style to use in rendering the bounding box.
DefaultInlineFormatType is an option for cells that specifies the format used for displaying expressions in a newly created inline cell.
DefaultLabelStyle is a low-level option for formatting and related constructs that specifies the default style to use in displaying their label-like elements.
DefaultTicksStyle is a low-level option for graphics functions that specifies the default style to use in rendering ticks.
DeleteContents is an option for DeleteDirectory that specifies whether the contents of directories should automatically be deleted.
Deployed is an option for displayed objects, cells, and notebooks that specifies whether their contents should be considered deployed, so that elements such as Slider, ...
DiracComb[x] represents the Dirac comb function giving a delta function at every integer point. DiracComb[x_1, x_2, ...] represents the multidimensional Dirac comb function.
DirectedInfinity[] represents an infinite numerical quantity whose direction in the complex plane is unknown. DirectedInfinity[z] represents an infinite numerical quantity ...
Directive[g_1, g_2, ...] represents a single graphics directive composed of the directives g_1, g_2, ....
EdgeLabels is an option and property for Graph and related functions that specifies what labels and label positions should be used for edges.