SplineWeights is an option for B-spline functions and graphics primitives that specifies weights of control points.
StateSpaceRealization is an option to StateSpaceModel that specifies its canonical representation.
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 ...
SymmetricGroup[n] represents the symmetric group of degree n.
TagSet
(Built-in Mathematica Symbol) f /: lhs = rhs assigns rhs to be the value of lhs, and associates the assignment with the symbol f.
TransferFunctionExpand[tf] expands polynomial terms in the numerators and denominators of the TransferFunctionModel object tf.
TransferFunctionFactor[tf] factors the polynomial terms in the numerators and denominators of the TransferFunctionModel object tf.
UndirectedGraphQ[g] yields True if the graph g is an undirected graph and False otherwise.
UniformGraphDistribution[n, m] represents a uniform graph distribution on n-vertex, m-edge graphs.
VectorScale is an option to VectorPlot, ListVectorPlot, and related functions that determines the length and arrowhead size of field vectors that are drawn.