RotationTransform[\[Theta]] gives a TransformationFunction that represents a rotation in 2D by \[Theta] radians about the origin.RotationTransform[\[Theta], p] gives a 2D ...

RoundingRadius is an option for Rectangle, Framed, and related functions that specifies the radius of the circle to use in rendering rounded corners.

Round[x] gives the integer closest to x. Round[x, a] rounds to the nearest multiple of a.

RowAlignments is an option for the low-level function GridBox that specifies how entries in each row should be aligned.

RowBox[{box_1, box_2, ...}] is a low-level box construct that represents a row of boxes or strings in a notebook expression.

RowLines is an option for the low-level function GridBox that specifies whether lines should be drawn between adjacent rows.

RowMinHeight is an option for the low-level function GridBox that specifies the minimum total height in units of font size that should be allowed for each row.

Row[{expr_1, expr_2, ...}] is an object that formats with the expr_i arranged in a row, potentially extending over several lines. Row[list, s] inserts s as a separator ...

RowReduce[m] gives the row-reduced form of the matrix m.

RowsEqual is an option for the low-level function GridBox that specifies whether all rows in the grid should be assigned equal total height.