What are miniranks?

What are they? I see them when people post all the time but don't know what they are. Don't remember them being part of the website when I was really active a few years ago but I just might not have noticed then.

I also won a minirank from one of the Christmas die-roll things, but where is it? How do I see my own miniranks?

 

Check both of these out:
Guide to miniranks
FAQ

They might take a little while to show/update. Christmas nes aren't out just yet, but soon, I believe.