PageBreakBelow is an option for Cell which specifies whether a page break should be made immediately below the cell if the notebook that contains the cell is printed.
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.
PlusMinus[x] displays as \[PlusMinus]x.PlusMinus[x, y, ...] displays as x \[PlusMinus] y \[PlusMinus] ....
PolynomialExtendedGCD[poly_1, poly_2, x] gives the extended GCD of poly_1 and poly_2 treated as univariate polynomials in x.PolynomialExtendedGCD[poly_1, poly_2, x, Modulus ...
RightArrow[x, y, ...] displays as x \[RightArrow] y \[RightArrow] ....
SelectionAnimate[notebook] animates graphics in the current selection in a notebook. SelectionAnimate[notebook, t] animates graphics for t seconds.
SingleLetterItalics is an option for Cell that specifies whether single-letter names should be displayed in italics.
Small
(Built-in Mathematica Symbol) Small is a style or option setting that specifies that objects should be small.