What does PR stands for in terms of Domain?

[amber shaheen]

If someone says that "I want to but PR domain" than it mean he is interested to buy some those domain which have some PR ( pagerank ) in google search.
here is the detail of PR ( pagerank ):
PageRank is what Google uses to determine the importance of a web page. It's one of many factors used to determine which pages appear in search results. Search engines typically linked to pages that had the highest keyword density, which meant people could game the system by repeating the same phrase over and over to attract higher search page results.
PageRank is one of many factors that determines where your web page appears in search result ranking, but if all other factors are equal, PageRank can have significant impact on your Google rankings.
PageRank is measured on a scale of one to ten and assigned to individual pages within a website, not the entire website. To find the PageRank of a page, use Google Toolbar. Very few pages have a PageRank of 10, especially as the number of pages on the Internet increases.