There are seven frieze groups, which can be written in orbifold notation as 
,
, 
, 
, 
, 
, 
.
Frieze Group
See also
Frieze Pattern, Orbifold NotationExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Frieze Group." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/FriezeGroup.html