x - y is equivalent to x + (-1*y).
SuperscriptBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for SuperscriptBox objects.
Superscript[x, y] is an object that formats as x^y.
As of Version 6, SurfaceColor has been superseded by Specularity and Glow.
As of Version 6.0, SurfaceGraphics has been superseded by GraphicsComplex and related functionality.
SurvivalDistribution[{e_1, e_2, ...}] represents a survival distribution with event times e_i.SurvivalDistribution[{w_1, w_2, ...} -> {e_1, e_2, ...}] represents a survival ...
SurvivalFunction[dist, x] gives the survival function for the symbolic distribution dist evaluated at x.SurvivalFunction[dist, {x_1, x_2, ...}] gives the multivariate ...
SuzukiDistribution[\[Mu], \[Nu]] represents the Suzuki distribution with shape parameters \[Mu] and \[Nu].
Switch
(Built-in Mathematica Symbol) Switch[expr, form_1, value_1, form_2, value_2, ...] evaluates expr, then compares it with each of the form_i in turn, evaluating and returning the value_i corresponding to ...
SymmetricMatrixQ[m] tests whether m is a symmetric matrix.