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Usually when we speak about pagerank, we mean the toolbar pagerank. This is a number between 0 and 10.
The real PageRank (i.e. the PageRank calculated by the famous formulae of the founders of Google: Page and Brin) is a number between 0 and something very huge, something like the total number of pages on the internet (probably multiplied by 0.15).
Via a logarithmic function, the latter pagerank is mapped onto the first one, making it a workable number.