Label of a conjugacy class (awaiting review)

The label of a rational conjugacy class of a group $G$ has the format $NA$ where $N$ is the order of elements in the conjugacy class, $A$ is a capital letter code.

The label of a complex conjugacy class of a group $G$ has the format $NAj$ where $N$ is the order of elements in the conjugacy class, $A$ is a capital letter code for the rational conjugacy class corresponding to this class, and $j$ is an enumeration of class within that rational conjugacy class ($j$ is omitted if there is a single class within rational conjugacy classes).