International vehicle registration code registration plate. When the distinguishing sign is incorporated in the registration plate, it must also appear on the front registration plate of the vehicle. The requirement to display a separate distinguishing sign is not necessary within the European Economic Area, for vehicles with license plates in the common EU format which satisfy the requirements of the Vienna Convention, and so are also valid in non-EU countries signatory to the convention. Separate signs are also not needed for Canada, Mexico and the United States, where the province, state or district of registration is usually embossed or surface-printed on the vehicle registration
Ship registration to register on their national register, and some forbid foreign-flagged vessels from trading between ports within the country (a practice known as cabotage). The country of registration is a ship's flag state and determines its nationality as well as which country's laws govern its operation and the behavior of its crew. Each registry has its own rules as to the types of vessels that it will accept for registration. The Liberian Registry, for example, registers seagoing vessels of more than 500 net tons that conduct foreign trade. Vessels over the age of 20 require a waiver as well as the