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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 lower-case letters preceding the capital letter.
See also Polyhedron, Schläfli Symbol, Wythoff Symbol
References
Hart, G.  ``Conway Notation for Polyhedra.''
  http://www.li.net/~george/virtual-polyhedra/conway_notation.html.