Polysiedra

Polysiedra is a term used in geometry to describe a solid figure composed of multiple polyhedra. This means a polysiedron is a three-dimensional shape made up of several individual polyhedra joined together. The way these polyhedra are connected can vary, leading to a wide range of possible polysiedra.

The concept of a polysiedron is a generalization of a polyhedron, which is a single solid bounded by flat polygonal faces. In a polysiedron, the constituent polyhedra can share faces, edges, or vertices. The resulting shape might have complex internal structures or a single, unified exterior surface, depending on the arrangement of the component polyhedra.

Examples of polysiedra could include shapes formed by attaching two cubes side-by-side, or more complex structures where several tetrahedra are fused together. The study of polysiedra is relevant in fields like computational geometry and crystallography, where complex shapes need to be represented and analyzed. The term itself suggests a multitude of "seats" or bases, alluding to the multiple polyhedral components.