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| • | UDC CONSORTIUM | |
| • | UL - UNDERWRITERS LABORATORIES (ESTADOS UNIDOS) | |
| • | UNDATA | |
| • | UNESCO - ORGANIZACION DE LAS NACIONES UNIDAS PARA LA EDUCACION, LA CIENCIA Y LA CULTURA | |
| • | UNI - ENTE NAZIONALE ITALIANO DI UNIFICAZIONE (ITALIA) | |
| • | UNIRED 2011 | |
| • | UNIT - INSTITUTO URUGUAYO DE NORMAS TECNICAS (URUGUAY) | |
| • | UNITED NATIONS STATISTICS DIVISION | |
| • | UNIVERSITIES WORLDWIDE | |
| • | UNION EUROPEA | |
| • | UNMZ (CSN) - URAD PRO TECHNICKOU NORMALIZACI, METROLOGII A STATNI ZKUSEBNICTVI (REPUBLICA CHECA) | |
| • | USABILITY AND UX ARTICLES FROM NIELSEN NORMAN GROUP | |
| • | USP - UNITED STATES PHARMACOPEIAL CONVENTION | |
| • | USPTO - UNITED STATES PATENT AND TRADEMARK OFFICE | |
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| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |