What is the best name for a compound made from nitrogen and oxygen (N2O3)?

There are several compounds made from nitrogen and oxygen. They all depend on the oxidation state of the nitrogen.

N2O ' (Nitrous oxide ; 'Laughing Gas' . Each nitrogen atoms in in oxidation state '+1'.

NO ' (Nitrogen monoxide ; Oxid'n state of 'N' is '+2').

NO2 ' ( Nitrogen dioxide ; Oxid'n state of 'N' is '+4'

N2O5 (Nitrogen pentoxide ; Oxid'n state of 'N' is '+5'.