Semiregular polyhedron

A semiregular polyhedron is a special type of 3-D shape made up of flat surfaces called faces. Semiregular polyhedrons look like prisms and pyramids, although their faces are all different. All of their faces are made up of the same types of shapes, like triangles, rectangles, or pentagons, but each face has a different number of those shapes. For example, a semiregular polyhedron could have 4 triangular faces and 6 rectangular faces.