An octahedron is a polyhedron with eight faces, twelve edges, and six vertices
Hexagonal prism
then it's a - Dodecahedron
a twelve sided shape with 12 faces, 30 edges and 20 vertices.
A hexagonal prism.
A quadrilateral based pyramid.
It depends on the exact shape. An octahedron is a shape with eight faces. It can be a heptagonal pyramid (8 vertices, 14 edges), or a hexagonal prism (12 vertices, 18 edges), square dipyramid (6 vertices, 12 edges) are some examples. There are more.
There is no limit to the number of vertices nor edges.
A sphere has no faces, edges, or vertices.
The shape of a triangular based pyramid has 4 vertices, 6 edges and 4 faces
A square prism is a three-dimensional shape that has two parallel and identical square bases connected by rectangular faces. It has eight vertices, twelve edges, and six faces.
Vertices = Corners