What does "zone address" mean?

Each Airzone zone defines a living area that can be heated by one or more heating circuits. In the case of the RadianT365 system, we can assign several wireless heads (radiators) to the same zone.

As an example, this would correspond to the case of a room with two radiators controlled by a single Blueface thermostat. Zone 1, assigned in this case to the Blueface, would control the heads 1 and 2, which correspond to the two radiators in the room.