Representation method of lattice

The type of space lattice can be represented by Pearson symbol, and the first letter in the symbol is lowercase, which represents the crystal system. The second is a capital letter, which represents the grid type. Note that the unit cell of the rhombohedral system is a simple unit cell, but R is used as its lattice symbol. Crystal system symbol lattice type symbol triclinic A simple P monoclinic M bottom center G orthogonal O body center I hexagonal H face center F tetragonal T rhombic R cubic C