For Ink, Adobe hydro-formed an elongated triangular prism with a gradual counterclockwise twist running down its length from tip to end. Users who apply a "standard" grip should find the design ...

Besides the regular and semiregular solids, there are just ninety-two other convex polyhedra with regular faces. In 1966, the American mathematician Norman W. Johnson, a student of H.S.M. Coxeter at ...