U

UK

United Kingdom.

underline

This should be avoided on the Web except for hyperlinks, because readers have been conditioned to think that clicking on underlined text will link them to another part of your document, another document, or another website.

See also [formatting]
See also [links]
unique visitor

An individual visitor to a website within a specified time frame. For the unique-visitor measure, repeat visits by that visitor within that time frame are not counted by the site’s traffic measurement system.

See also [hit]
UNIX

A powerful operating system developed by Ken Thompson and Dennis Ritchie at AT&T Bell Laboratories in 1969.

unsubscribe

The unsubscribe process is the process by which a subscriber is removed from a ...

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