It is a nonahedron.
A cube or a cuboid
A 11 sided shape is called a hendecagon.
A shape with 11 sides and angles is called an 11-gon, or a hendecagon.
A pentagonal pyramid.
A six faced 3d shape is called a cube.
Enneahedral
A twelve sided shape is called a "dodecahedron" :D
A pyramid.
Decahedreon
It is a nonahedron.
An 8-faced 3D shape is called an octahedron. It is a polyhedron with eight triangular faces, 12 edges, and six vertices.
It is called a trihedron. It does not exist.
Dodecahedron.
A cube or a cuboid
A shape that has 11 sides is called a hendecagon.
Any six-sided shape is a hexagon.