What is the Google Links on a Pagerank button?

[FilmFoo]

http://www.gorepit.net/

If you go to my website, on the right hand side I have a pagerank button. It shows my Google Pagerank, Links, and Yahoo and Inlink.

What are:

Google Links
Yahoo: 270 ( whats 270? )
Yahoo Inlinks?

I only know what the pagerank is. Im confused, does anyone know what these are? And what they represent?

Thanks in advance 🙂

 

[AquaTeen]

Google:
Site: http://www.google.com/search?q=site%3Agorepit.net
Inlink: http://www.google.com/search?q=link%3Agorepit.net

Yahoo:
Site: http://siteexplorer.search.yahoo.com/se ... orepit.net
Inlink: http://siteexplorer.search.yahoo.com/se ... .net&bwm=i

The site part is how many pages the search engine has indexed of your site
The Inlink part is how many pages the search engine has indexed of your site being linked on another site.