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UNIX
Universal Interactive Executive. Unix is a computer operating system introduced by Bell Laboratories. Despite its undeniable values in high-end computing, it is far from intuitive.
URL
Uniform Resource Locator. The unique address of a document, graphic or other item on the internet.
USB
Universal Serial Bus. Used for connecting peripheral devices such as printers or scanners to a computer.
UTP
Unshielded Twisted Pair. Also referred to as 10BASE-T or 100BASE-T network cable.