Credentials under name when posting

[alexander_TG]

This is just a general question from a curious forum user. Under some people names on the forum, it will say, Jr. Member or Sr. Member, and others still have anywhere from one to five of the little tan orchid flowers under their name also. What do these different things mean and what are the requirements for them? I know the one that is blue and like fades out to a FS means that person is a forum supporter. Like I said, just a curious mind who appreciates the feedback!