SquareWave[x] gives a square wave that alternates between +1 and -1 with unit period.SquareWave[{y_1, y_2}, x] gives a square wave that alternates between y_1 and y_2 with ...
StringReplacePart["string", " snew", {m, n}] replaces the characters at positions m through n in " string" by " snew". StringReplacePart["string", " snew", {{m_1, n_1}, {m_2, ...
Subgraph[g, {v_1, v_2, ...}] gives the subgraph of the graph g generated by the vertices v_i.Subgraph[g, {e_1, e_2, ...}] gives the subgraph generated by the edges ...
SubStar
(Built-in Mathematica Symbol) SubStar[expr] displays as expr_*.
SymmetricMatrixQ[m] tests whether m is a symmetric matrix.
TaggingRules is an option for selections that specifies a list of strings to be associated with a selection.
TextRecognize[image] recognizes text in image and returns it as a string.
Tiny
(Built-in Mathematica Symbol) Tiny is a style or option setting that specifies that objects should be tiny.
TukeyLambdaDistribution[\[Lambda]] represents Tukey's lambda distribution with shape parameter \[Lambda].TukeyLambdaDistribution[\[Lambda], \[Mu], \[Sigma]] represents ...
UnderBar[expr] displays with a bar under expr.