The symbol denoting the lattice type(Bravais type) to which the
translational subgroup (vector lattice) of the space group
belongs. It consisting of a lower case letter indicating the
crystal system followed by an upper case letter indicating
the lattice centring. The setting-independent symbol mS
replaces the setting-dependent symbols mB and mC, and the
setting-independent symbol oS replaces the setting-dependent
symbols oA, oB and oC (see International Tables for
Crystallography A 1995 edition p.13).