SelectionEvaluate[notebook] replaces the current selection in a notebook with the result obtained by evaluating the contents of the selection in the kernel. ...
ShowStringCharacters is an option for Cell that specifies whether to display " when a string is entered.
Skeleton[n] represents a sequence of n omitted elements in an expression printed with Short or Shallow. The standard print form for Skeleton is <<n>>.
Skip
(Built-in Mathematica Symbol) Skip[stream, type] skips one object of the specified type in an input stream. Skip[stream, type, n] skips n objects of the specified type.
StreamStyle is an option to StreamPlot, StreamDensityPlot, and related functions that determines the style to use for drawing streamlines.
StringFormat["string"] attempts to determine what ImportString format could be used to import the string " string".
String
(Built-in Mathematica Symbol) String is the head of a character string " text".
SynchronousInitialization is an option for Manipulate, DynamicModule, and related functions that specifies whether or not to evaluate the expression given as the setting for ...
SystemOpen["target"] opens the specified file, URL, or other target with the associated program on your computer system.
SystemsModelLabels is an option to StateSpaceModel and TransferFunctionModel that specifies labels of the variables.