The Symmetry major menu implements the application of crystallographic symmetry to a molecule. This requires that entries exist in the database for the unit cell and the symmetry operators of the space group of the molecule. These can be added via Read_formatted or by the Symm_setup commands. The Symm_sphere command generates complete molecules for the symmetry related molecules. Their names are generated from user supplied names. After a call to Symm_sphere the molecules exist in the database as molecules in their own right, until overwritten by a later call or deleted by the user. The user may like to paint carbons a different colour to make the symmetry atoms easier to recognise. If the asymmetric unit contains more then one chain, and these exist as separate molecules in the database, then a number of symmetry commands may be necessary to show all neighboring molecules.