# Point symmetry

### From Online Dictionary of Crystallography

##### Revision as of 16:26, 10 April 2017 by MassimoNespolo (talk | contribs) (→See also: 6th edition of ITA)

Revision as of 16:26, 10 April 2017 by MassimoNespolo (talk | contribs) (→See also: 6th edition of ITA)

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

## 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 of Crystallography, Volume A*, 6^{th}edition