The default is usually something like "new member" which, after a set number of posts is upgraded by the software to "full member" or something similar. These things simply reflect how many posts a person has made. They're really meaningless. In fact, you can change it to anything you like in your profile, as I have done.
2022 Cougar Half Ton 24RDS fifth wheel
2014 Coachmen Catalina 253RKS (sold)
2017 F350 6.7L DRW CC LB 4x4 Lariat