| United States Executive Order 9066 | Undernet | Underground |
| United States Office of Homeland SecurityOn October 8, 2001, in response to the September 11, 2001 attacks, President George W. Bush announced the establishment of an executive-level Office of Homeland Security to coordinate " homeland security" efforts, to be headed by Governor Tom Ridge with t | UnixUNIX (or Unix is a portable, multi-task and multi-user computer operating system originally developed by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie and Douglas McIlroy. Unices The term Unices includes Unix and Unix-like ope | United States ConstitutionLaw for the United States of America The Constitution of the United States is the supreme law of the United States of America and is the oldest written national constitution still in force. It was completed on September 17, 1787, with its adoption by the |
| Unratified Amendment Twelve to the United States ConstitutionThis amendment to the United States Constitution was one of twelve originally proposed in 1789. Ten of them became the Bill of Rights. An eleventh lapsed into obscurity for many years, but was eventually ratified as the Twenty-seventh Amendment more than | Universal Postal UnionThe Universal Postal Union (UPU) a international organization that coordinates postal policies between member nations, and hence the world-wide postal system. Each member country agrees to the same set of terms for conducting international postal duties. | United KingdomThe United Kingdom of Great Britain and Northern Ireland is a state in Western Europe, usually known simply as the United Kingdom the UK Britain or less accurately as Great Britain . The UK was formed by a series of Acts of Union which united the formerly |
| University of MichiganThe University of Michigan, Ann Arbor is a public coeducational university located in Ann Arbor, Michigan. It is the oldest and main campus of the University of Michigan, which also includes branches University of Michigan-Dearborn and University of Michi | UnemploymentIn economics, a person who is able and willing to work yet is unable to find a paying job is considered unemployed . The unemployment rate measures the number of unemployed workers as a proportion of the total civilian labor force, where the latter includ | UnicodeIn computing, Unicode is the international standard whose goal is to provide the means to encode the text of every document people want to store in computers. This includes all scripts still in active use today, many scripts known only by scholars, and sy |
| Ungulate | Unclassified game | United States Congress |
| United States Senate | Unmanned space mission | United Nations |
| University of Washington | Unit | University of Pennsylvania |
| University | University of Cambridge | University of Oxford |
| University of Bergen | University of Oslo | Universal access |
| Unidentified flying object | Unix-like | Unicon |
| Under Suspicion | United States Declaration of Independence | Universal Copyright Convention |
| Universe | United States | Uncertainty principle |
| United Nations Framework Convention on Climate Change | Universal Declaration of Human Rights | United Nations Educational, Scientific and Cultural Organization |
| Universalism | Unitarian Universalist Association | United Nations University |
| Until the End of the World | United States copyright law | University of Rochester |
| University of California, San Francisco | University of California | University of California, Berkeley |
| University of California, Santa Cruz | University of California, Davis | University of California, San Diego |
| University of Sydney | Undead | United Nations Convention on the Law of the Sea |
| Unix billennium | UN Security Council | United Nations General Assembly |
| UN Economic and Social Council | UN Trusteeship Council | United Nations High Commissioner for Refugees |
| United Nations member states | United Airlines Flight 175 | United States Department of State |
| United Airlines Flight 93 | United States Capitol | Unicode and HTML |
| Universal character set | United States Democratic Party | University of Southern California |
| United States Natural Law Party | University of Arizona | University of Texas at Austin |
| University of South Africa | Unix shell | University of Tulsa |
| United States Libertarian Party | University of Sussex | Union for a Europe of Nations |
| Unitarian Universalism | Universal Serial Bus | United States Whig Party |
| United States Democratic-Republican Party | United States Navy | United States Federalist Party |
| United States Army | United States Marine Corps | United States Air Force |
| University of Toronto | University College of Cape Breton | University of New Brunswick |
| University of Sudbury | University of Prince Edward Island | University of Utah |
| University of Victoria | University of Manitoba | Universal (metaphysics) |
| United Nations Convention to Combat Desertification | Uniramia | University of Chicago |
| Uniformitarianism (science) | Universal Decimal Classification | University of Durham |
| Universal precautions | Uniform Resource Identifier | Union of International Associations |
