Select
(Built-in Mathematica Symbol) Select[list, crit] picks out all elements e_i of list for which crit[e_i] is True. Select[list, crit, n] picks out the first n elements for which crit[e_i] is True.
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.
ShowShortBoxForm is an option for cells that specifies whether box expressions, which are used to represent two-dimensional forms in a cell, are displayed in a more compact ...
ShrinkingDelay is an option for dynamic objects that specifies how long to delay before shrinking the size of the region in which the object is displayed to the actual size ...
SignPadding is an option for NumberForm and related functions that specifies whether padding should be inserted after signs.
SixJSymbol[{j_1, j_2, j_3}, {j_4, j_5, j_6}] gives the values of the Racah 6-j symbol.
SpokenString[expr] gives a string of text corresponding to a spoken representation of the expression expr.
StackBegin[expr] evaluates expr, starting a fresh evaluation stack.
StackComplete[expr] evaluates expr with intermediate expressions in evaluation chains included on the stack.
StackInhibit[expr] evaluates expr without modifying the evaluation stack.