an octahedron: basically two square based pyramids with their bases stuck together.
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they dont have a name really :/ 3D squares are cubes
Well, honey, a three-dimensional diamond is called a "diamond." It doesn't matter if it's 2D or 3D, it's still a diamond. So, go ahead and dazzle 'em with that sparkly gemstone, whether it's on paper or popping out of the screen.
HEXADECAHEDRON is the correct name for a 16 sided 3D object
A 3d parallelogram is called a "Parallelepiped"
Yes but the correct term is octohedron