OverTilde[expr] displays with a tilde over expr.
OverVector[expr] displays with a right vector over expr.
ParallelProduct[expr, {i, i_max}] evaluates the product \[Product]i = 1 i_max expr in parallel.ParallelProduct[expr, {i, i_min, i_max}] starts with i = ...
PixelConstrained is an option for ArrayPlot which specifies how to constrain cells to align with displayed pixels.
Positive[x] gives True if x is a positive number.
Postfix
(Built-in Mathematica Symbol) Postfix[f[expr]] prints with f[expr] given in default postfix form: expr // f. Postfix[f[expr], h] prints as exprh.
Precedes[x, y, ...] displays as x \[Precedes] y \[Precedes] ....
Prefix
(Built-in Mathematica Symbol) Prefix[f[expr]] prints with f[expr] given in default prefix form: f@expr. Prefix[f[expr], h] prints as hexpr.
PrintPrecision is an option for selections that specifies the maximum number of digits used for displaying a machine-precision number.
RadicalBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for RadicalBox objects.