UNTSO: United Nations Truce Supervision Organization
UNU: United Nations University
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
VHF: very-high-frequency
VSAT: very small aperture terminal
WADB: West African Development Bank