| Union of South Africa | University of California, Irvine | United Arab Republic |
| Un*xA Un x computer system is a Unix or other multiuser POSIX-based system. UNIX" is a registered trademark of The Open Group, so systems such as GNU/Linux, Mac OS X, FreeBSD, NetBSD, and OpenBSD can't use it without paying royalties that would be too expensi | Uniform distributionIn mathematics, the uniform distributions are simple probability distributions. The distribution can be either discrete or continuous. In the discrete case, they can be characterized by saying that all possible values are equally probable. In the continuo | Universal algebraUniversal algebra is the field of mathematics that studies the ideas common to all algebraic structures. Basic idea From the point of view of universal algebra, an algebra is a set A together with a collection of operations on A. An n- ary operation on A |
| United Negro College FundUnited Negro College Fund headquartered in Fairfax, Virginia is an American philanthropic organization with the mission of raising college tuition money for African-American students and as well as general scholarship funds for historically African-Americ | United Nations Trust TerritoriesUnited Nations Trust Territories were the successors of the League of Nations mandates and came into being when the League of Nations ceased to exist in 1946. All of the trust territories were administered through the UN Trusteeship Council. Trust territo | United States Postmaster GeneralThe Postmaster General is the executive head of the United States Postal Service. From 1872 to 1971, the postmaster general was the head of an executive department concerned with the postal service (the Post Office Department). During that period, he was |
| United States Secretary of Housing and Urban DevelopmentThe United States Secretary of Housing and Urban Development is the head of the United States Department of Housing and Urban Development, concerned with urban housing matters. The Secretary is a member of the President's Cabinet. On January 13, 1966, Rob | United States Secretary of TransportationThe United States Secretary of Transportation is the head of the United States Department of Transportation. The Secretary is a member of the President's Cabinet. The current Secretary is Norman Mineta, the only Democrat in the cabinet of President George | United States Secretary of EnergyThe United States Secretary of Energy is the head of the United States Department of Energy, concerned as the name suggests, with energy production and regulation. The Secretary is a member of the President's Cabinet. Secretaries of Energy Name Term of Of |
| United States Secretary of Veterans Affairs | United States Secretary of Health, Education, and Welfare | Undocumented feature |
| United States Senate Majority Leader | United States Senate Minority Leader | Unknown DJ |
| UniCOS | UN Security Council Resolution 242 | Union (set theory) |
| Universal jurisdiction | University of Minnesota | United States constitutional law |
| Unit interval | Universal Disk Format | United States Postal Service |
| Uniform convergence | United Nations Commission on Human Rights | Unconventional superconductor |
| Uncle Tom | Unit 101 | United States Post Office Department |
| United States Atomic Energy Commission | Underwater archaeology | United States diplomatic history |
| University College London | United Nations Iraq-Kuwait Observation Mission | United States Department of Justice |
| United Kingdom of the Netherlands | United Provinces | University of Vienna |
| Unitary authority | University of Idaho | United States Department of the Treasury |
| Universal Product Code | Uncaria | United States Bureau of Land Management |
| Union of Utrecht | Unicycle | Unification |
| United Federation of Planets | Underwood tariff | United States Census Bureau |
| United Nations Children's Fund | United States Secret Service | United States Department of Transportation |
| United States Department of Homeland Security | United States Department of Health and Human Services | Unmanned Aerial Vehicle |
| Unterseeboot 691 | Unterseeboot 553 | Unterseeboot 413 |
| United Kingdom legislation | Unterseeboot 238 | Unterseeboot 2 |
| Unterseeboot 760 | Unterseeboot 573 | United States Naval Academy |
| Unterseeboot 490 | Unterseeboot 460 | Unterseeboot 461 |
| Unterseeboot 462 | Unterseeboot 463 | Unterseeboot 464 |
| Unterseeboot 487 | Unterseeboot 488 | Unterseeboot 489 |
| Unterseeboot 459 | University of Virginia | Unknot |
| University of Southern Mississippi | Unique factorization domain | University of Florida |
| University of South Florida | University of Northern Iowa | Unterseeboot 27 |
| University of London | University of Bristol | University of Warwick |
| United Nations Truce Supervision Organization | Unisys | Universitat de Girona |
| University of Barcelona | Universitat Autònoma de Barcelona | Ununhexium |
| Ununoctium | United States Department of Energy | Ungoliant |
| Uncertainty | Universitat Politècnica de Catalunya | Universitat Pompeu Fabra |
| United Nations Population Fund | Union City | University of Edinburgh |
