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.
WhitespaceCharacter represents a single whitespace character in StringExpression.
$Echo
(Built-in Mathematica Symbol) $Echo gives a list of files and pipes to which all input is echoed.
$GeoLocation is a settable global variable that specifies the default geodetic location to use.
$InitialDirectory gives the initial directory when the current Mathematica session was started.