A holyhedron is polyhedron whose faces and holes are all finite-sided polygons and that contains at least one hole whose boundary shares
no point with a face boundary. 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).