icosahedron
Usage examples:

Within the Earth's orbit inscribe an icosahedron the sphere inscribed in it will be Venus's orbit.
Thomas Orchard in "The Astronomy of Milton's 'Paradise Lost'". 
If you cut out a piece of cardboard of the form shown in the smaller diagram, and cut half through along the dotted lines, it will fold up and form a perfect icosahedron
Henry Ernest Dudeney in "Amusements in Mathematics". 
The five regular solids, in appropriate order Octahedron, Icosahedron Dodecahedron, Tetrahedron, Cube.
Oliver Lodge in "Pioneers of Science". 
Now, inscribe in the earth an icosahedron the sphere inscribed in it will be Venus: inscribe an octahedron in Venus: the circle inscribed in it will be Mercury.
Walter W. Bryant in "Kepler".