U
 | UA User Asynchronous
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| UAN Universal Application Network Standards based architecture for integration that runs on most of the main integration servers
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| UAP Upper Address Part
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| UAR Universal Asynchronous Receiver
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| UART Universal Asynchronous Receiver Transmitter Chip used to drive a serial port in a PC |
| UBR |
Unspecified Bit Rate
| UCD |
Upstream Channel Descriptor
| UDB |
Universal DataBase
| UDDI |
Universal Description Discovery and Integration
Format for describing and integrating internet business
| UDP |
User Datagram Protocol
| UDP Universal Datagram Packets Connectionless internet protocol with no guarantee of delivery
|
| UHF Ultra High Frequency
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| UI User Interface
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| UIAC Unlimited Inquiry Access Code
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| UID User IDentification
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| UIMSBF Unsigned Integer Most Significant Bit First
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| UIO Universal Input Output
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| UMB Upper Memory Block Memory between 640k and 1M in DOS |
| UML |
Unified Modeling Language
| UMTS |
Universal Mobile Telecommunications System
Offers third generation broadband packet based transmission of text, digitised voice, video and multimedia at data rates upto 2 Mbps
| UNC Universal Naming Convention
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| UNI User Network Interface
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| UPC Usage Parameter Control
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| UPS Un-interruptible Power Supply A device that continues to supply power after primary supply outage.
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| URI Uniform Resource Identifier
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| URL Uniform Resource Locator The standard address of a location on the Internet
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| URN Uniform Resource Name
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| USART Universal Synchronous Asynchronous Receiver Transmitter
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| USB Universal Serial Bus
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| USCW Uncacheable Speculative Write Combining
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| USOC Universal Service Order Codes
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| USPARC Ultra Scalable Processor Architecture Reduced instruction set Computer
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| USTA United States Telephone Association
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| UT Upper Tester
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| UTC Universal Coorinated Time
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| UTP Unshielded Twisted Pairs |