PageFooters is an option for notebooks that specifies what should be inserted as the footer of each page of a notebook when it is printed.
PageHeaders is an option for notebooks that specifies what should be inserted as the header of each page of a notebook when it is printed.
ParentDirectory[] gives the parent of the current working directory. ParentDirectory["dir"] gives the parent of the directory dir.
PatternSequence[p_1, p_2, ...] is a pattern object which represents a sequence of arguments matching p_1, p_2, ....
PlusMinus[x] displays as \[PlusMinus]x.PlusMinus[x, y, ...] displays as x \[PlusMinus] y \[PlusMinus] ....
PolarAxes is an option for sector charts and polar plots that specifies whether polar axes should be drawn.
RemoveAlphaChannel[image] removes all opacity information from image.RemoveAlphaChannel[image, c] removes opacity by blending all pixels with the background color c.
RightArrow[x, y, ...] displays as x \[RightArrow] y \[RightArrow] ....
RudvalisGroupRu[] represents the sporadic simple Rudvalis group Ru.
SelectionAnimate[notebook] animates graphics in the current selection in a notebook. SelectionAnimate[notebook, t] animates graphics for t seconds.