<page_title> Space group </page_title> <section_title> Classification systems </section_title> <table> <cell> Affine space group types (219 in three dimensions). Two space groups, considered as subgroups of the group of affine transformations of space, have the same affine space group type if they are conjugate under an affine transformation. </cell> </table>
In three dimensions, there are 219 types in Space group.