We call 4n the class of 3-valent plane graphs whose faces are 4-gons (necesarily six 4-gons) or 6-gons.

• the point group C1
  
• the point group Cs
  
• the point group C2
  
• the point group Ci
  
• the point group C2v
  
• the point group C2h
  
• the point group D2
  
• the point group D3
  
• the point group D2d
  
• the point group D2h
  
• the point group D3d
  
• the point group D3h
  
• the point group D6
  
• the point group D6h
  
• the point group O
  
• the point group Oh