Chicago UID – (i) User ID uig – (s) Uyghur language (ISO 639-2 code) UIL – (i) University Interscholastic League (governing body for most interscholastic activities, notably sports, in Texas public high schools) UIUC – (i) University of Illinois Urbana-Champaign UIW – (i) University of the Incarnate Word UJ UJTL – (i) Universal Joint Task List UJT – Unijunction transistor UK uk – (s) Ukrainian language (ISO 639-1 code) UK (i) United Kingdom (also (s) FIPS 10-4 country code) (i) University of Kentucky UKDA – (i) United Kingdom Data Archive UKIP - (a) UK Independence Party ukr – (s) Ukrainian language (ISO 639-2 code) UKR – (s) Ukraine (ISO 3166 trigram) UL UL – (i) Underwriters Laboratories ULEB – (a) Union des ligues européens de basket-ball, French for "Union of European Basketball Leagues" ULF – (i) Ultra Low Frequency ULOF – unprotected loss of flow (nuclear accident) ULOHS – unprotected loss of heat sink (nuclear accident) UTOP – unprotected transient overpower (nuclear accident) UM UM – (s) United States Minor Outlying Islands (postal symbol; ISO 3166 digram) UMA – (i) Upper Memory Area UMB – (i) University of Maryland, Baltimore UMBC – (i) University of Maryland, Baltimore County UMC – (i) United Microelectronics Corporation – University of Missouri–Columbia UMD – (i) University of Maryland, College Park UMCP – (i) University of Maryland, College Park UMES – (i) University of Maryland Eastern Shore UMGC – (i) University of Maryland, Global Campus UMI – (s) United States Minor Outlying Islands (ISO 3166 trigram) UMIST – (a) University of Manchester Institute of Science and Technology UMK – (i) Uniwersytet Mikołaja Kopernika (Polish "Nicolaus Copernicus University") UML – (i) Unified Marxist-Leninist Communist Party of Nepal – Unified Modeling Language – University of Massachusetts Lowell – User-Mode Linux UMNO – (a) United Malays National Organisation (Malaysia) UMTS – (i) Universal Mobile Telecommunications System UN UN – (i) United Nations UNABOM – (p) University and airline bomber (FBI case name) UNAIDS – (i/a) Joint United Nations Programme on HIV/AIDS UNaM – (p/a) Universidad Nacional de Misiones (Spanish, "National University of Misiones") UNAM – (a) Universidad Nacional Autónoma de México (Spanish, "National Autonomous University of Mexico") UNAMSIL – (p) United Nations Mission in Sierra Leone UNCF – (i) United Negro College Fund UNCLOS – (a) United Nations Convention on the Law of the Sea UNCSGN – (i) United Nations Conference on the Standardization of Geographical Names UNCTAD