U
UAE
United Arab Emirates
UDEAC
Central African Customs and Economic Union
UHF ultra-high-frequency
UK
United Kingdom
UMA
Arab Maghreb Union
UN
United Nations
UNAMSIL
United Nations Mission in Sierra Leone
UNCLOS
United Nations Convention on the Law of the Sea, also know as LOS
UNCTAD
United Nations Conference on Trade and Development
UNDCP
United Nations Drug Control Program
UNDOF
United Nations Disengagement Observer Force
UNDP
United Nations Development Program
UNEP
United Nations Environment Program
UNESCO
United Nations Educational, Scientific, and Cultural Organization
UNFICYP
United Nations Peace-keeping Force in Cyprus
UNFPA
United Nations Population Fund
UNHCR
United Nations High Commissioner for Refugees
UNICEF
United Nations Children's Fund
UNICRI
United Nations Interregional Crime and Justice Research Institute
UNIDIR
United Nations Institute for Disarmament Research
UNIDO
United Nations Industrial Development Organization
UNIFIL
United Nations Interim Force in Lebanon
UNITAR
United Nations Institute for Training and Research
UNMEE
United Nations Mission in Ethiopia and Eritrea
UNMIK
United Nations Interim Administration Mission in Kosovo
UNMIL
United Nations Mission in Liberia
UNMIT
United Nations Integrated Mission in Timor-Leste
UNMOGIP
United Nations Military Observer Group in India and Pakistan
UNMOVIC
United Nations Monitoring, Verification, and Inspection Commission
UNOCI
United Nations Operation in Cote d'Ivoire
UNOMIG
United Nations Observer Mission in Georgia
UNOPS
United Nations Office of Project Services
UNRISD
United Nations Research Institute for Social Development
UNRWA
United Nations Relief and Works Agency for Palestine Refugees in the
Near East
UNSC
United Nations Security Council
UNSSC
Untied Nations System Staff College
UNTSO
United Nations Truce Supervision Organization
UNU
United Nations University
UNWTO
World Tourism Organization
UPU
Universal Postal Union
US
United States
USSR Union of Soviet Socialist Republics (Soviet Union); used for information dated before 25 December 1991
UTC
Coordinated Universal Time
UV ultra violet