Ship’s particulars; length, breadth and moulded depth; gross tonnage and net tonnage.
Both tonnages are simple numbers having no units of measurement. The gross tonnage (GT) of RMS Queen Mary 2, for example, is 148, 528 while her net tonnage (NT) is 98, 720. It is wrong to say that she is of “148, 528 gross tons and 98, 720 net tons”. A worse error, often made by landlubbers, is to state that she weighs 148, 528 gross tons!