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Figure 3
Due to the ambiguity of Fig. 2[link], a unit cell U with a motif [M\subset U] can define a periodic point set only after choosing an ordered basis for U. A periodic point set is a union of lattices [\Lambda+\vb{p}] shifted by all [{\bf p}\in M]. A periodic crystal is a periodic set of atoms (points with chemical elements or other attributes).

IUCrJ
Volume 11| Part 4| July 2024| Pages 453-463
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524004056