A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

UPS
Uninterruptible Power Supply. A system which allows computers to keep running for a limited time during a power failure. It gives you the chance to save data before your system crashes.

URL
Uniform resource locator is the address of a file accessible on the Internet, such as a website address. The unique identification of a web site or web resource, such as http://www.scottish-enterprise.com

USB
Universal Serial Bus. A standard port that enables you to connect external devices

USM
USM stands for Ultra Silent Motor, this simply means that the lens will focus more quietly than a non-USM lens.