VertexLabelPosition is an option that allows the user to place a vertex label in a certain position relative to the vertex.
VertexNumberColor is an option that can be used in ShowGraph to associate different colors to vertex numbers.
VertexNumber is an option that can take on values True or False. This can be used in ShowGraph to display or suppress vertex numbers.
VertexStyle is an option that allows the user to associate different sizes and shapes to vertices.
VertexWeight is an option that allows the user to associate weights with vertices.
Wheel
(Combinatorica Package Symbol) Wheel[n] constructs a wheel on n vertices, which is the join of CompleteGraph[1] and Cycle[n - 1].
Zoom
(Combinatorica Package Symbol) Zoom[{i, j, k, ...}] is a value that the PlotRange option can take on in ShowGraph. Setting PlotRange to this value zooms the display to contain the specified subset of ...
AllPoints
(Computational Geometry Package Symbol) AllPoints is an option to ConvexHull that specifies whether all distinct points on the hull or only the minimum set of points needed to define the hull are returned.
IdealDivide[x, y] gives the correctly rounded result of x divided by y involving a single rounding error.
MachineError[f, x -> a] gives the error involved in evaluating f at x = a using machine arithmetic.