ScalingMatrix[{s_x, s_y, ...}] gives the matrix corresponding to scaling by a factor s_i along each coordinate axis.ScalingMatrix[s, v] gives the matrix corresponding to ...
ScrollingOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for notebooks that specifies settings for scrolling.
SetAttributes[s, attr] adds attr to the list of attributes of the symbol s.
SpheroidalQS[n, m, \[Gamma], z] gives the angular spheroidal function QS n, m (\[Gamma], z) of the second kind.
SplineKnots is an option for B-spline functions and graphics primitives that specifies the positions of knots.
UnitBox
(Built-in Mathematica Symbol) UnitBox[x] represents the unit box function, equal to 1 for |x| <= 1/2 and 0 otherwise.UnitBox[x_1, x_2, ...] represents the multidimensional unit box function, equal to 1 if ...
UnitTriangle[x] represents the unit triangle function on the interval |x| <= 1 .UnitTriangle[x_1, x_2, ...] represents the multidimensional unit triangle function on the ...
$CommandLine is a list of strings giving the elements of the original operating system command line with which Mathematica was invoked.
$DynamicEvaluation is a symbol whose value is True if it is evaluated as part of the evaluation of a Dynamic.
$MachineType is a string giving the general type of computer on which Mathematica is being run.