The Full International Hermann-Mauguin space group symbol as
defined in Section 2.3 and given as the second item of the
second line of one of the Space Group Tables of Section 7 of
International Tables for Crystallography Vol. A (1995).
Each component of the space group name is separated by a
space or an underscore. The use of space is strongly
recommended. The underscore is only retained because it
was used in earlier archived files. It should not be
used in new CIFs.
Subscripts should appear without special symbols. Bars should
be given as negative signs before the numbers to which they
apply. The commonly used Hermann-Mauguin symbol determines the
space group type uniquely but a given space group type may
be described by more than one Hermann-Mauguin symbol. The
space group type is best described using the *.IT_number
or *.name_Schoenflies. The Full International Hermann-Mauguin
symbol contains information about the choice of basis for
monoclinic and orthorhombic space groups but does not give
information about the choice of origin. To define the setting
uniquely use *.name_Hall, list the symmetry operations
or generators, or give the transformation relating
the setting used to the reference setting defined in this
dictionary under *.reference_setting.