UNA
The six characters that announce: "here are my EDIFACT separators".
Definition
When present, UNA precedes UNB and fixes six service characters: component separator within a composite (":"), data element separator ("+"), decimal notation ("."), release character ("?"), reserved (" "), segment terminator ("\""). Required when deviating from UNOC defaults.
Origin
Defined by ISO 9735-1 (EDIFACT Syntax rules — application-level service characters).
Example in context
UNA:+.? '