A notation for polyhedra which begins by specifying a "seed" polyhedron using a capital letter.
The Platonic solids are denoted T (tetrahedron),
O (octahedron), C (cube),
I (icosahedron), and D (dodecahedron),
according to their first letter. Other polyhedra include the prisms,
P
,
antiprisms, A
, and pyramids, Y
, where 
specifies the number of sides of the polyhedron's base.
Operations to be performed on the polyhedron are then specified with lowercase letters preceding the capital letter.
