CupCap (Built-in Mathematica Symbol)

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

Cup (Built-in Mathematica Symbol)

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

Del (Built-in Mathematica Symbol)

Del[x] displays as \[Del]x.

Diamond (Built-in Mathematica Symbol)

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

Directory (Built-in Mathematica Symbol)

Directory[] gives the current working directory.

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] ....