“Group” is the most general term applied to any user-set aggregation of zones and may be used at any level of aggregation; e.g., 5,000 zones could be aggregated into 5 groups or 500 into 250.
As with nodes and zones, groups have numerical “names” which need not be sequential although in some applications there may be an upper limit, e.g., 999, on the maximum group name. Again, as with nodes and zones, a “proper” group cannot have a name of zero, although if a zone has not been allocated to an explicit group then it is assigned to group 0 – which in certain applications will result in a fatal error.