Member Status Levels

What are the qualifications or determining factors for Newbie, Jr. Member, Full Member, etc? And how many levels are there currently?

I believe this is an automatic feature of the SMF forum software; all forums "categorize" users by the number of posts. Most of them allow the forum admin to specify the text used for the different levels. I don’t know the numbers involved. Some forums I’ve worked with advanced from "newbie" at 50 posts. It really doesn’t mean anything at all as far as MODx is concerned.