2.Japan&#39；s abbreviation is IJN (Japan).United States is USN (United States).United Kingdom is RN (United Kingdom).and Germany is GMN (Germany)。3.Here is a list of country abbreviations worldwide。- AE： United Arab Emirates。- AG： Antigua and Barbuda。- AL： Albania。- AM： Armenia。- AO： Angola。- AT： Austria。- AU： Australia。- AZ： Azerbaijan。