LocatorRegion is an option for Locator that specifies where the locator object should by default be allowed to go when it is dragged.
PageBreakAbove is an option for Cell which specifies whether a page break should be made immediately above the cell if the notebook that contains the cell is printed.
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.
PageBreakWithin is an option for Cell which specifies whether a page break should be allowed within the cell if the notebook that contains the cell is printed.
PriceGraphDistribution[n, k, a] represents a de Solla Price graph distribution for n-vertex graphs where a new vertex with k edges is added at each step using attractiveness ...
PrimeQ
(Built-in Mathematica Symbol) PrimeQ[expr] yields True if expr is a prime number, and yields False otherwise.
ProgressIndicator[x] represents a progress indicator with setting x in the range 0 to 1. ProgressIndicator[Dynamic[x]] takes the setting to be the dynamically updated current ...
RefreshRate is an option to Animate and related functions which specifies the refresh rate for frames in animations.
ReturnExpressionPacket[expr] is a MathLink packet that contains the expression expr, the result of an EnterExpressionPacket evaluation.
ScriptMinSize is an option for Style that specifies the minimum font size to use in rendering subscripts, etc.