Primarily used in geometry to describe a crystal or a solid shape with eight triangular faces.

Geometry Usage

Imagine two pyramids base-to-base to understand an octahedron's structure in 3D.

Visual Reference

An octahedron can resemble a standard eight-sided die used in games.

In chemistry, it describes the 3D arrangement of atoms around a central one.

Commonly found in transition metals, used when discussing complex molecules.

It entails equal angles and distances from the center to the vertices in molecules.

 said that the best was to use a truncated octahedron which, as you all know -- is this thing here!