This field specifies the Phase IV synonym for the node.  Phase IV
 synonyms can be used in place of fully specified node names,
 particularly with applications that do not support full node names.

 The synonym must be from 1 to 6 letters (A to Z) or digits (0 to 9),
 with at least one letter.  If the field is left blank, a synonym name
 is not registered for the node.