Her Britannic Majesty, or His Britannic Majesty (HBM), depending on the sex of the monarch, is a treaty title for the monarch of the United Kingdom, a royal style used in international law and diplomacy. It is used on the international plane in the same way that "His Majesty" or "Her Majesty" is used to refer to the king or queen domestically, the addition of "Britannic" serving to identify the state (United Kingdom) in question. It is particularly used in treaties and other formal instruments sent and received between nations. Many other monarchies in Europe used similar conventional terms as treaty titles to identify their respective monarchs.