A holyhedron is a polyhedron in which every face contains at least one hole whose boundary shares no point
with the outer boundary of that face. The faces
and their holes are bounded by finite-sided polygons.
D. Wilson coined the term in 1997, although no actual holyhedron was known until
1999, when a holyhedron with 
faces was constructed (Vinson
2000).
J. H. Conway believes that the minimal number of faces should be closer to 100, and offered a prize of 
divided by the number of faces for a better solution.
A holyhedron with 492 faces was subsequently discovered, good for a prize of 
(Hatch).
