SpanAdjustments is an option for selections that specifies the height and width of spanning characters.
SpanCharacterRounding is an option for selections that specifies the method used for rounding a spanning character when its size is to be adjusted.
SpanSymmetric is an option for selections that specifies whether vertically expandable characters are symmetric about the axis of the selection.
SpellingCorrection is an option for StringMatchQ, Names, and related functions that specifies whether strings should be considered to match even when a small fraction of the ...
Square
(Built-in Mathematica Symbol) Square[x] displays as \[Square]x.
StartingStepSize is an option to NDSolve and related functions that specifies the initial step size to use in trying to generate results.
StartOfLine represents the start of a line in a string for purposes of matching in StringExpression.
StartOfString represents the start of a string for purposes of matching in StringExpression.
StopScheduledTask[obj] deactivates the task obj.
StreamPosition[stream] returns an integer that specifies the position of the current point in an open stream.