Yeah! @Imdadc - it simply means that your site is already indexed, crawled or raped by Google. 0 is higher than N/A....
Yes this is the fact, when we introduced a new site, it always show no page rank information but as we boost our work, make good theme base, relevant and quality back links for our site, the page rank of our site moves forwards. Everything depends on your best SEO efforts and this is the fact also that the page rank is affected by the quality of your back links.