U
UKHL - United Kingdom House of Lords (upper house of the British Parliament)
UKSC - United Kingdom Supreme Court
UN - United Nations
UNCLOS - United Nations Convention on the Law of the Sea
UNESCO - United Nations Educational, Scientific, and Cultural Organization
US - United States of America
USMCA - United States-Mexico-Canada Agreement (trade agreement between the U.S., Canada, and Mexico, which replaced the North American Free Trade Agreement (NAFTA))