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.

p?test is a pattern object that stands for any expression which matches p, and on which the application of test gives True.

ReadList["file"] reads all the remaining expressions in a file and returns a list of them. ReadList["file", type] reads objects of the specified type from a file, until the ...

RudvalisGroupRu[] represents the sporadic simple Rudvalis group Ru.

RunThrough["command", expr] executes an external command, giving the printed form of expr as input and taking the output, reading it as Mathematica input, and returning the ...

ShowContents is an option for selections that specifies whether an object represented by a StyleBox should be displayed on the screen or replaced by blank space.

SpanSymmetric is an option for selections that specifies whether vertically expandable characters are symmetric about the axis of the selection.

UnitVector[k] gives the two-dimensional unit vector in the k\[Null]^th direction.UnitVector[n, k] gives the n-dimensional unit vector in the k\[Null]^th direction.

UsingFrontEnd[expr] evaluates expr, making use of a front end if necessary.