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A hackney or hackney carriage (also called a cab, black cab, hack or London taxi) is a carriage or automobile for hire. A livery carriage superior to the hackney was called a remise. In the United Kingdom, the name hackney carriage today refers to a taxicab licensed by the Public Carriage Office in Greater London or by the local authority (non-metropolitan district councils or unitary authorities) in other parts of Great Britain, or by the Department of the Environment in Northern Ireland. In the United States, the police department of the city of Boston has a Hackney Carriage Unit, analogous to taxicab regulators in other cities, that issues Hackney Carriage medallions to its taxi operators.[3]