The coat of arms of the United Kingdom, also referred to as the royal arms, are the arms of dominion of the British monarch, currently Charles III. They are used by the Government of the United Kingdom and by other Crown institutions, including courts in the United Kingdom and in some parts of the Commonwealth. Differenced versions of the arms are used by members of the British royal family. The monarch's official flag, the royal standard, is the coat of arms in flag form.
There are two versions of the coat of arms. One is used in Scotland, and includes elements derived from the coat of arms of the Kingdom of Scotland, and the other is used elsewhere and includes elements derived from the coat of arms of the Kingdom of England. The shields of both versions of the arms quarter the arms of the kingdoms of England and Scotland, which united to form the Kingdom of Great Britain in 1707, and the Kingdom of Ireland, which united with Great Britain to form the United Kingdom in 1801. The Irish quarter was unaltered following the division of Ireland into Northern Ireland and the Irish Free State in 1922.