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]....

DoubleLongLeftRightArrow (Built-in Mathematica Symbol)

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

DoubleLongRightArrow (Built-in Mathematica Symbol)

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

DoubleRightArrow (Built-in Mathematica Symbol)

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

DoubleUpArrow (Built-in Mathematica Symbol)

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