交大游凱復的心得整理:Special forms
The kis operator has a variation, kn, which only adds pyramids to n-sided faces.
The truncate operator has a variation, tn, which only truncates order-n vertices.
The operators are applied like functions from right to left. For example:
the dual of a tetrahedron is dT;
the truncation of a cube is t3C or tC;
the truncation of a cuboctahedron is t4aC or taC.
All operations are symmetry-preserving except twisting ones like s and g which lose reflection symmetry.