In principle, symmetry elements can be represented by matrices. If a symbolic representation is more appropriate, the relationship between the representation by a symbol, matrices, quaternions, etc. has to be established. For symmetry elements that are members of crystallographic point groups, all this is automatically perpared if GTPack is invoked.
This is not the case for the Icosahedron. GTIcosahedronAxes installs all the additionally necessary axes for this case.
