A lattice defined by the combination of one of the seven possible crystal systems and one of the possible lattice centrings, i.e. (1) primitive, in which only the cell corners are occupied, (2) body centred, in which there is a point at the centre, (3) face centred, in which there are points at the centres of all the faces, (4) centred at a single face, in which there is a point at the centre of one of the faces. The Bravais lattice is named after the French physicist Auguste Bravais (1811–63), who demonstrated in 1850 that in three spatial dimensions there are fourteen possible such lattices.