A twelve sided shape is called a "dodecahedron" :D
Dodecahedron.
A solid figure with 12 faces is called a dodecahedron.
A six faced 3d shape is called a cube.
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 twelve-faced shape is a dodecagon, also known as a dodecahedron.
It is a 12 faced shape
Enneahedral
A hendecahedron.
A dodecahedron has 12 rhombus-shaped faces.
Decahedreon
A pyramid.
It is a nonahedron.