LongLeftRightArrow (Built-in Mathematica Symbol)

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

LongRightArrow (Built-in Mathematica Symbol)

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

MinusPlus (Built-in Mathematica Symbol)

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

NotCongruent (Built-in Mathematica Symbol)

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

NotDoubleVerticalBar (Built-in Mathematica Symbol)

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

NotEqualTilde (Built-in Mathematica Symbol)

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

NotExists (Built-in Mathematica Symbol)

NotExists[x, y] displays as \[NotExists] _x y.

NotGreaterEqual (Built-in Mathematica Symbol)

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

NotGreater (Built-in Mathematica Symbol)

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

NotGreaterTilde (Built-in Mathematica Symbol)

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