It is called a trihedron. It does not exist.
tetrahedron is a 4 faced 3d shape.
A six faced 3d shape is called a cube.
icosahedron
Its a 17 faced 3d shape
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.
Decahedreon
A Triangular Prism
It is a nonahedron.
It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.
Dodecahedron.
A cube, or cuboid.
Decahedron.Decahedron.Decahedron.Decahedron.