This object is a unique numeric identifier for a security zone entry on the NetScreen firewall, and the description notes its practical values range between 1 and 65535 even though the syntax technically allows a wider range, with no inherent meaning beyond serving as an index. Administrators use it purely to cross-reference a zone's configuration row, such as its name and type, in this table. For example, this object might report the value 3, identifying the third configured security zone, whose name and type would be found in the same table row.