SphericalHankelH1[n, z] gives the spherical Hankel function of the first kind h_n^(1)(z).
SpheroidalRadialFactor[n, m, c] gives the spheroidal radial factor with degree n and order m.
SpheroidalS1Prime[n, m, \[Gamma], z] gives the derivative with respect to z of the radial spheroidal function S_n^m, (1)(\[Gamma], z) of the first kind.
SpheroidalS2[n, m, \[Gamma], z] gives the radial spheroidal function S_n^m, (2)(\[Gamma], z) of the second kind.
SquareSubsetEqual[x, y, ...] displays as x \[SquareSubsetEqual] y \[SquareSubsetEqual] ....
SquareSupersetEqual[x, y, ...] displays as x \[SquareSupersetEqual] y \[SquareSupersetEqual] ....
StableDistribution[type, \[Alpha], \[Beta], \[Mu], \[Sigma]] represents the stable distribution S_type with index of stability \[Alpha], skewness parameter \[Beta], location ...
StartupSound is a global option that specifies whether Mathematica plays a sound when it is launched.
StringSkeleton[n] represents a sequence of n omitted characters in a string printed with Short. The standard print form for StringSkeleton is an ellipsis.
TransformationMatrix[tfun] gives the homogeneous matrix associated with a TransformationFunction object.