tetrahedron is a 4 faced 3d shape.
Its a 17 faced 3d shape
It is an octahedron. There are 257 topologically distinct octahedra: with 6 to 12 vertices.
A 12 sided 3D shape is a dodecahedron.
A six faced 3d shape is called a cube.
A Triangular Prism
It is a nonahedron.
An eight-faced 3D shape is called an octahedron. Any 3D shape (polyhedron) ends in -hedron, just like any 2D shape (polygon) ends in -gon, and octa- means 8.
A 12 sided 3D shape is called a dodecahedron.