**4. The nanovoid of an ideal crystal**

This section shows that crystallographic nanovoids, which are not defects of the crystal structure, may be limited to atom filling. It is suggested that we consider coordination polyhedra as simple forms or consider their combinations. The relation between the multi‐ plicity, the number of regular point systems, the coordination number, and the number of formula units per unit сеll is obtained in the form of algebraic equations. On the basis of these equations, it has been shown that for all 14 Bravais lattices there are 146 соrrеsроnding coordination spheres with an аrrangеmеnt of atoms inside these spheres that is consistent with both space and point groups of symmetry. The shapes of the coordination polyhedra inscribed into these spheres соrrеsроnd (with due regard for the vertex occupancies) to 146 crystallo‐ graphic types for 47 simple forms.
