Wallpaper Groups
Symmetry group 16  (p6)
This group contains 60° rotations, that is, rotations of order 6.  It also 
contains rotations of orders 2 and 3, but neither reflections nor glide reflections.  The lattice is hexagonal.  A fundamental region for the symmetry group is one-sixth of an equilateral triangle of the lattice.
 

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© 1994, 1997.
David E. Joyce 
Department of Mathematics and Computer Science
Clark University
Worcester, MA 01610
 
These files are located at http://aleph0.clarku.edu/~djoyce/wallpaper/