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A 4-polytope, also known as a 4-dimensional polytope or a polychoron, is a four-dimensional geometric object that is the generalization of polygons (2-dimensional) and polyhedra (3-dimensional). In more simple terms: 1. **Polygon**: A 2-dimensional shape with straight sides (e.g., triangle, square). 2. **Polyhedron**: A 3-dimensional shape with flat polygonal faces (e.g.