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An octahedron is a type of polyhedron that consists of eight triangular faces. It is one of the five Platonic solids, which are convex polyhedra with faces that are all congruent, regular polygons. The regular octahedron has 12 edges and 6 vertices. In a regular octahedron, each vertex is where four triangular faces meet, and the dihedral angle between two adjacent faces is approximately 109.47 degrees.