Are you asking, "What does PR 7 mean" or are you asking for an example of a homepage that has a PR 7?
If you want to know what it means, PR stands For PageRank (Google PageRank, and is available to see from your Google toolbar if you have turned it on in the options. A homepage with a PR 7 would be a homepage with a PageRank of 7/10. More info here: http://www.google.com/technology/