Spherical polyhedron

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A spherical projection of the icosahedron viewed orthographically (left) and stereographically (right).

A spherical polyhedron is a type of non-Euclidean polyhedron that is a tiling of the sphere where all edges are great arcs. Usually it is implied that the faces are convex. Self-intersection may or may not be allowed.

The regular spherical polyhedra are spherical projections of the Platonic solids, the regular hosohedra, and the regular dihedra. Hosohedra and dihedra are degenerate in Euclidean space but perfectly valid for spherical polyhedra.