Recent Examples of octahedron from the Web
They are defined by symmetry, and the Greeks knew that there were only five possibilities meeting the criteria: the tetrahedron, cube, octahedron, dodecahedron and icosahedron.
Diamonds, which form eight-sided crystals called octahedrons, can be billions of years old, Dr. Harlow said.
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Britannica.com: Encyclopedia article about octahedron
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