Proportion (Built-in Mathematica Symbol)

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

RandomImage (Built-in Mathematica Symbol)

RandomImage[max, {w, h}] gives an image of dimensions {w, h} with pseudorandom pixel values generated from a uniform distribution in the range 0 to max.RandomImage[{min, ...

Regularization (Built-in Mathematica Symbol)

Regularization is an option for Sum and Product that specifies what type of regularization to use.

ReverseElement (Built-in Mathematica Symbol)

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

ReverseEquilibrium (Built-in Mathematica Symbol)

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

ReverseUpEquilibrium (Built-in Mathematica Symbol)

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

RightArrowBar (Built-in Mathematica Symbol)

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

RightArrowLeftArrow (Built-in Mathematica Symbol)

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

RightDownTeeVector (Built-in Mathematica Symbol)

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

RightDownVectorBar (Built-in Mathematica Symbol)

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