Greater London is often referred to as "the City" or "the Square Mile" and it forms the main financial district. Archaically, the urbanised area of London was known as the Metropolis. In common usage, the terms "London" and "Greater London" are usually used interchangeably. Greater London is officially divided for some purposes, with varying definitions, into Inner London and Outer London. For some strategic planning purposes it is divided into five sub-regions. Greater London is under the strategic local governance of the Greater London Authority (GLA). It consists of an elected assembly, the London Assembly, and an executive head, the Mayor of
Coat of arms of the City of London Coat of arms of the City of London The coat of arms of the City of London is the official coat of arms of the City of London, which is one of a number of cities and boroughs in Greater London. The Corporation of the City of London has a full achievement of armorial bearings consisting of a shield on which the arms are displayed, a crest displayed on a helmet above the shield, supporters on either side and a motto displayed on a scroll beneath the arms. The blazon of the arms is as follows: Arms: "Argent a cross