If $G = (V, E)$ is a simple graph, what is the name of the quantity
$$\frac{|E|}{\binom{|V|}{2}} = \frac{\text{number of edges}}{\text{maximal number of edges}}\;\text{?}$$
If $G = (V, E)$ is a simple graph, what is the name of the quantity
$$\frac{|E|}{\binom{|V|}{2}} = \frac{\text{number of edges}}{\text{maximal number of edges}}\;\text{?}$$
As @Zubzub commented, this is the graph density.