International vehicle registration code system is used for vehicles belonging to the diplomats of foreign countries with license plate from the host country. That system is host country-specific and varies largely from country to country. For example TR on a diplomatic car in the USA indicates Italian, not Turkish. Such markings in Norway are indicated with numbers only, again different from international standards (e.g. 90 means Slovakian. International vehicle registration code The country in which a motor vehicle's vehicle registration plate was issued may be indicated by an international licence plate country code, formerly known as an International Registration Letter or International Circulation Mark.
Vehicle registration plates of France letters to identify the type of vehicle, for instance PS for first aid, followed by numbers. The Marseille Naval Fire Battalion () used regular plates with the Bouches-du-Rhône code, while the one in Brest used similar plates as the Navy. In Paris, RATP buses used special registration plates with only four numbers until March 2003, when standard registration plates were adopted. Diplomatic cars used green plates with orange or white lettering, depending on the series. Plates comprised one to three numbers identifying the embassy or the international organisation; letters identifying the status (C for consulates, CD for embassies, CMD for