Glossary Symmetry Group Classification: concept Chapter: Both Sides Now A symmetry group is just a collection of symmetry operations. More about Symmetry Group http://dogschool.tripod.com/trianglegroup.html http://www.cs.uleth.ca/~holzmann/notes/dihedral/dihedral.html http://web.science.mq.edu.au/~chris/geometry/chap07.pdf Superposition Symmetry Operation