Bravais law
From Online Dictionary of Crystallography
Loi de Bravais (Fr). Bravais-Gesetz (Ge). Legge di Bravais (It). ブラベー法則 (Ja). Ley de Bravais (Sp).
The Bravais law or Bravais rule states that the most prominent faces of a crystal are those parallel to internal planes having the greatest density of lattice nodes.