Well a higher PR or Pank Rank mainly indicates your site has a good content and seems to have a higher rank in Google. Some times the content does not have to be good as long as its entertaining and there are visitors Google gives it Priority so hence there are many factors to it.

That rank is basically Search Engine Ranking Position a.k.a SERP.

Here is a great and useful tool to easily check the serps: http://www.whatsmyserp.com/serpcheck.php hope this will help many.