An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. Each of these, being a different shape, has a different name. Some of the names are simple, for example,
but there are also names such as the tridiminished icosahedron or the gyrobifastigium.
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An octahedron has eight faces. If it has 62 faces then it is not an octahedron!
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. An octahedron has 8 faces (as the name implies). It can have 6 to 12 vertices and 12 to 18 edges.
A polyhedron is closed a 3-dimensional figure whose faces are all polygons. The prefix "octa-" refers to eight and an octahedron is a polyhedron with 8 faces.
octahedron (or plural: octahedra). Check on wikipedia or any other websites if you're still unsure.