polyhedron
octgonal prism
An octagonal prism, possibly.
Nonahedron
An octagonal pyramid.
octagonal prism
16 vertices.16 vertices.16 vertices.16 vertices.
Cone
The vertex of a 3D pentagon is 10. :)
A sphere.
A sphere.
In 2D, there are 6 vertices in a hexagon; there are 36 vertices in 6 hexagons. In 3D, it doubles up to 12 vertices.