VertexCount[g] gives a count of the number of vertices in the graph g.VertexCount[g, patt] gives a count of the number of vertices that match the pattern patt.

DegreeCentrality[g] gives a list of vertex degrees for the vertices in the underlying simple graph of g. DegreeCentrality[g, "InDegree"] gives a list of vertex ...

TokenWords is an option for Read and related functions which gives a list of token words to be used to delimit words.

RotateLabel is an option for graphics and related functions that specifies whether labels on vertical frame axes should be rotated to be vertical.

In an expression like f[{a,b,c}] you are giving a list as the argument to a function. Often you need instead to apply a function directly to the elements of a list, rather ...

VertexList[g] gives the list of vertices for the graph g.VertexList[g, patt] gives a list of vertices that match the pattern patt.

HoldForm[expr] prints as the expression expr, with expr maintained in an unevaluated form.

EdgeList[g] gives the list of edges for the graph g. EdgeList[g, patt] gives a list of edges that match the pattern patt.

NonConstants is an option for D which gives a list of objects to be taken to depend implicitly on the differentiation variables.

NumberSigns is an option for NumberForm and related functions which gives strings to use as signs for negative and positive numbers.