U | unit (of vertical measurement for racks and rack-mounted hardware) |
UART | Universal Asynchronous Receiver/Transmitter |
UDF | Universal Disk Format |
UDMA | ultra direct memory access |
UI | user interface |
UL | Underwriters Laboratories |
UMA | unified memory architecture or upper memory area |
UMB | upper memory block4 |
UNIVAC | Universal Automatic Computer |
UPC | universal product code |
UPI | Universal Peripheral Interface |
UPnP | Universal Plug and Play |
UPS | uninterruptible power supply |
URL | uniform resource locator |
USB | Universal Serial Bus |
USN | update sequence number |
UTP | unshielded twisted pair |
UXGA | Ultra Extended Graphics Array |