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Different degrees of similarity between inorganic crystal structures are defined concisely and examples are presented that illustrate their practical application. A notation giving the coordination of atoms is presented together with some basic rules for developing crystal-chemical formulae and the Bauverband description of inorganic structure types. Typical examples of the nomenclature are: pyrite Fe[6°]{g}[S2(3;1)t], [F(□2l) + F′FeS2Pa; spinel Mg[4]AI2[6]O4, ∞3[Mg[4t]lAl2[6o]O4[l,3;12co]], Fm222 + D, T′ MgAI2O4 Fdm.