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In the "Select Object" pane it tells you how many objects refer to this or are children. In the "Select Type" pane it tells you how many objects there are of that class. When you make a new thermal zone it already has 5 objects, So when you add a space to the thermal zone you get 6.

For reference, these objects are made with a zone and refer to it.
OS:Sizing:Zone
OS:Connection

These objects are made when you make a zone and are referred to by the zone
Two OS:PortList objects and another OS:Connection objects