What I know is that based on reputation, users get privileges e.g. the ability to see deleted posts, voting for flagged messages, reviews etc.
I noticed that moderator's display name has a
Diamond representing that this is Moderator:
Same way I suggest that there should be some other symbol which represent user's reputation e.g. more than 10K, 15k, 20k etc.
Further also want to know how many types of users exist and their roles, responsibility, access etc. I know about normal users and moderators, Any others?