It look like two square based pyramids stuck together on their square sides.
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In geometry, an octahedron is a polyhedron with eight sides. A regular octahedron is the dual polyhedron of a cube; It is a rectified tetrahedron.
A regular OCTAHEDRON.
The area of a regular octahedron with a side length of x is 2√3 * x²
8
A regular octahedron has 6 apexes as it can be rotated evenly as each face is congruent.