USPTO – Acronym for United States Patent & Trademark Office. See also Trademarks.
Unique Visitor – Identifies an actual web surfer (as opposed to a crawler) and is tracked by a unique identifiable quality (typically IP address). If a visitor comes to a web site and clicks on 100 links, it is still only counted as one unique visit.
Usability – This term refers to how "user friendly" a web site and its functions are. A site with good usability is a site that makes it easy for visitors to find the information they are looking for or to perform the action they desire. Bad usability is anything that causes confusion or problems for the user. For example, large Flash animations served to a visitor with a dial up connection causes poor usability. Easy, intuitive navigation and clear, informative text enhance usability.
User Agent - This is the identity of a web site visitor, spider, browser, etc. The most common user agents are Mozilla and Internet Explorer.