In mathematics and physics, a space group is the symmetry group of a configuration in space, usually in three dimensions. In three dimensions, there are 219 distinct types, or 230 if chiral copies are considered distinct. Space groups are also studied in dimensions other than 3 where they are sometimes called Bieberbach groups, and are discrete co...
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http://en.wikipedia.org/wiki/Space_group
in crystallography, any of the ways in which the orientation of a crystal can be changed without seeming to change the position of its atoms. These ... [3 related articles]
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http://www.britannica.com/eb/a-z/s/134
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