Diamond (Built-in Mathematica Symbol)

Diamond[x, y, ...] displays as x\[Diamond]y\[Diamond]....

DirectedEdges (Built-in Mathematica Symbol)

DirectedEdges is an option for Graph, GraphPlot, and related functions that specifies whether edges should be taken to be directed.

Directory (Built-in Mathematica Symbol)

Directory[] gives the current working directory.

DiscreteTimeModelQ (Built-in Mathematica Symbol)

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

DotEqual (Built-in Mathematica Symbol)

DotEqual[x, y, ...] displays as x \[DotEqual] y \[DotEqual] ....

DoubleBracketingBar (Built-in Mathematica Symbol)

DoubleBracketingBar[x, y, ...] displays as \[LeftDoubleBracketingBar]x, y, ...\[RightDoubleBracketingBar].

DoubleDownArrow (Built-in Mathematica Symbol)

DoubleDownArrow[x, y, ...] displays as x\[DoubleDownArrow]y....

DoubleLeftArrow (Built-in Mathematica Symbol)

DoubleLeftArrow[x, y, ...] displays as x \[DoubleLeftArrow] y \[DoubleLeftArrow] ....

DoubleLeftRightArrow (Built-in Mathematica Symbol)

DoubleLeftRightArrow[x, y, ...] displays as x \[DoubleLeftRightArrow] y \[DoubleLeftRightArrow] ....

DoubleLongLeftArrow (Built-in Mathematica Symbol)

DoubleLongLeftArrow[x, y, ...] displays as x\[DoubleLongLeftArrow]y\[DoubleLongLeftArrow]....