Stands for Page Rank, and is usually seen accompanied by a number i.e. ‘PR6’. It is a score of how trustworthy a particular site is as ranked by Google’s PageRank algorithm. A score of 10 is the highest, and unattainable by all but the most popular websites on the web.
A Score of 0 or N/A is the worst. The PR of a website must be evaluated next to similar websites and websites that have similar keywords to see how well it will do in search results.