U
UBAC - User-Based Access Controls (a form of access control that governs access to information based on a user's identity as authorized by the user's manager or supervisor)
UCS - Unfair Competition Law (California law dealing with unfair or deceptive business practices)
UDI - unique device identifier (Food and Drug Administration (FDA) proposal for a system of medical device identification that would improve evaluation of medical devices and support recalls)
UMLS - Unified Medical Language System (a biomedical thesaurus - Metathesaurus - developed by the U.S. National Library of Medicine (NML) that attempts to map data andj language across standards )
UPS - Uninterruptible Power Supply (a battery that provides power to a system in the event of a power failure; usually includes an alerting mechanism to signal the system to shut down "gracefully" to preserve the integrity of programs and data)