- Unicast: An IPv6 unicast address identifies a single destination. Packets with that unicast address go to that address.
- Unified Extensible Firmware Interface (UEFI): A configuration technology replacing BIOS.
- Uninterruptable Power Supply (UPS): An appliance that levels power surges and slumps and provide electrical power in the event of a loss of electrical service.
- Unshielded twisted-pair (UTP): Twisted-pair cable that has no additional shielding in the cable beyond the sheathing on each wire.
- User Account Control (UAC): Restricts changes to the system to only those authorized to do so.
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