- Flat Earth (Wikipedia)
Flat Earth is an archaic and scientifically disproven conception of the Earth’s shape as a plane or disk. Many ancient cultures subscribed to a flat-Earth cosmography.
- Polyhedron (Wikipedia)
In geometry, a polyhedron (pl.: polyhedra or polyhedrons; from Greek πολύ (poly-) ‘many’, and ἕδρον (-hedron) ‘base, seat’) is a three-dimensional shape with flat polygonal faces, straight edges and sharp corners or vertices.