| UA | United Airlines [IATA-Airline-Code / USA] |
| BFR | Berliner Flug Ring |
| DV | Lufttaxi Flug [IATA-Airline-Code/ Deutschland] |
| HF | Hapag-Lloyd Flug [IATA-Airline-Code/ Deutschland] |
| FC | Falcon Airlines Cargo Airlines [IATA-Airline-Code/ Vereinigte Arabische Emirate] |
| YX | Midwest Airlines / Midwest Express Airlines [IATA-Airline-Code / USA] |
| NW | Northwest Airlines / Northwest Orient Airlines [IATA-Airline-Code/ USA] |
| UA | United Atom |
| GB | United Kingdom |
| UA | United Artists |
| UP | United Press vgl. UPI |
| UHN | United Hackers Network Hackergruppe |
| USA | United States Army US-Armee, http://www.army.mil |
| USS | United States Ship |
| USA | United States of America Vereinigte Staaten von Amerika |
| USO | United Service Organizations |
| USM | United States Mail |
| USAF | United States Air Force |
| UTA | United Talent Agency |
| UBS | United Bank of Switzerland |
| US | United States [of America] |
| UAE | United Arab Emirates |
| FGOTUS | First Gentleman of the United States |
| POTUS | President Of The United States |
| USP | United States Pharmacopeia |
| UIP | United International Pictures |
| UPI | United Press International Washinton, DC, http://www.upi.com |
| UNO | United Nations Organisation Organisation der Vereinten Nationen, NYC, http://www.un.org |
| UPS | United Parcel Service |
| UCI | United Cinemas International |
| USFL | United States Football League |
| USMP | United States Microgravity Payload |
| USDA | United States Department of Agriculture |
| USMC | United States Marine Corps |
| USGA | United States Golf Association |
| UNEP | United Nations Environment Programm |
| USGS | United States Geological Survey |
| USIA | United States Information Agency |
| USD | United States [of America] Dollar [s] |
| USCG | United States Coast Guard |
| UNCLE | United Network Command for Law Enforcement |
| UNEP | United Nations Environment Program Umweltprogramm der Vereinten Nationen |
| UNFPA | United Nations Population Fund Bevölkerungsfonds der Vereinten Nationen |
| UKST | United Kingdom Schmidt Telescope |
| UNDP | United Nations Development Programme Entwicklungsprogramm der Vereinten Nationen |
| UN-Nummer | United Nations Gefahrgut-Kennzeichnungsnummer |
| UNSC | United Nations Security Council UN-Sicherheitsrat, NY, http://www.un.org/docs/sc |
| USAC | United States Answer Center |
| USAC | United States Auto Club |
| UN | United Nations [Vereinte Nationen] New York City, http://www.un.org,http://www.uno.de |