GB and GBR are the standard country codes for the United Kingdom (see ISO 3166-2 and ISO 3166-1 alpha-3) and are consequently used by international organisations to refer to the United Kingdom.
Additionally, the United Kingdom's Olympic team competes under the name "Great Britain" or "Team GB".
This meant that the United Kingdom created in 1707 by the Treaty of Union between England and Scotland encompassed all of Great Britain.
The Kingdom of Ireland merged with this state in 1801 to form the United Kingdom of Great Britain and Ireland.
The UK is a developed country and has the world's sixth-largest economy by nominal GDP and ninth-largest economy by purchasing power parity.The adjective "British" is commonly used to refer to matters relating to the United Kingdom.The term has no definite legal connotation, but is used in law to refer to United Kingdom citizenship and matters to do with nationality.The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign country in western Europe.Lying off the north-western coast of the European mainland, the UK includes the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands.The term "Britain" is often used as synonym for the United Kingdom.The term "Great Britain", by contrast, refers conventionally to the island of Great Britain, or politically to England, Scotland and Wales in combination.Subsequent medieval English kings completed the conquest of Wales and made an unsuccessful attempt to annex Scotland.Following the Declaration of Arbroath, Scotland maintained its independence, albeit in near-constant conflict with England.The UK is also a member of the Commonwealth of Nations, the Council of Europe, the G7 finance ministers, the G7 forum, the G20, NATO, the Organisation for Economic Co-operation and Development (OECD), and the World Trade Organization (WTO).The 1707 Acts of Union declared that the kingdoms of England and Scotland were "United into One Kingdom by the Name of Great Britain", though the new state is also referred to in the Acts as the "Kingdom of Great Britain", "United Kingdom of Great Britain" and "United Kingdom".