There are totally three lattice types which are:
i) Primitive (P) lattices. In this case, there is only one lattice point per unit cell.
ii) Bodycentered (I) lattices. In this case, there is a lattice point at the corners and one in the center of the cell.
iii) A, B, C or Fcentered lattices. In this case, there is a lattice point at the corners and others at one (A, B, C) or all three (F) of the faces.
Table 3021. Lattice types.
Lattice types 
Description 
P 
Primitive (simple unit cell): Lattice points on corners only 
I 
Body centered (from the German "Innenzentriert"): Lattice points on corners as well as in the center of the unit cell body 
F 
Face centered (from the German "Flächenzentriert"): Lattice points on corners as well as in the centers of all faces of the unit cell 
A 
Base centered on A faces only: Lattice points on corners as well as centered on bcfaces 
B 
Base centered on B faces only: Lattice points on corners as well as centered on acfaces 
C 
Base centered on C faces only: Lattice points on corners as well as centered on abfaces 
R 
Rhombohedral: Hexagonal class only 
