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 the United Kingdom Air Force codice_76. Since 1949, British military vehicle registration numbers are mostly either in the form of two digits, two letters, two digits (e.g. codice_77), or from 1995 onwards, two letters, two digits, two letters (for example, codice_78). Until the mid-1980s, the central two letters signified the armed service, or the branch or category of vehicle. For example, Chief of Fleet Support's staff car in 1983–85 was codice_79, and First Sea Lord's car codice_80 and Second Sea Lord's codice_81, normal civilian plates replacing them when security required; and, in 1970, one of 's Land Rovers was codice_82 and 's ship's