SetStreamPosition[stream, n] sets the current point in an open stream.
ShearingTransform[\[Theta], v, n] gives a TransformationFunction that represents a shear by \[Theta] radians along the direction of the vector v, normal to the vector n, and ...
ShowAutoStyles is an option for Cell that specifies whether styles that are specified to be automatically used for various syntactic and other constructs should be shown.
SoundVolume is an option to Sound and SoundNote and related functions that specifies the relative volume of the sound produced.
Sphere
(Built-in Mathematica Symbol) Sphere[{x, y, z}, r] represents a sphere of radius r centered at (x, y, z). Sphere[{x, y, z}] represents a sphere of radius 1. Sphere[{{x_1, y_1, z_1}, {x_2, y_2, z_2}, ...}, ...
StackBegin[expr] evaluates expr, starting a fresh evaluation stack.
StreamColorFunction is an option for StreamPlot and related functions that specifies a function to apply to determine colors along streamlines.
x_y^z is the low-level box representation for x_y^z in notebook expressions.
Timing
(Built-in Mathematica Symbol) Timing[expr] evaluates expr, and returns a list of the time in seconds used, together with the result obtained.
Trigger
(Built-in Mathematica Symbol) Trigger[Dynamic[u]] represents a trigger that can be pressed to make the dynamically updated value of u be continually increased with time from 0 to 1. Trigger[Dynamic[u], ...