symmorphic group
1symmorphic — adjective Describing a space group in which all symmetry operations (apart from translation) leave one common point in a fixed location …
2Space group — In mathematics and geometry, a space group is a symmetry group, usually for three dimensions, that divides space into discrete repeatable domains. In three dimensions, there are 219 unique types, or counted as 230 if chiral copies are considered… …
