# Point symmetry

### From Online Dictionary of Crystallography

Symétrie ponctuelle (*Fr*). Punktsymmetrie (*Ge*). Simmetria del sito, simmetria puntuale (*It*). Simetría puntual (*Sp*).

## Definition

The point symmetry of a position is its site symmetry. The point symmetry, or point group, of a lattice is the group of linear mappings (symmetry operations, isometries) that map the vector lattice **L** onto itself. Those geometric crystal classes to which point symmetries of lattices belong are called holohedries.

## See also

- Chapter 3.2 of
*International Tables for Crystallography, Volume A*, 6th edition