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In geometry, an octahedron (: octahedra or octahedrons) is any polyhedron with eight faces. One special case is the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex. Many types of irregular octahedra also exist, including both convex and non-convex shapes.
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An octahedron is a three-dimensional geometric shape with eight flat faces, and the most common type—called a regular octahedron—is made up of eight identical equilateral triangles arranged so that four triangles meet at each corner point. While regular octahedra are important as one of the five Platonic solids, many other irregular octahedra exist with different shapes and properties.
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