It has to do with "reputation"......................................
If you find a member's post helpful, encouraging, etc., you may click on the up arrow below and to the right of the post. The number to the right of the arrow is the number of "reputation" points given. Back to your profile page is a tab on the left "reputation" and that shows you the source of the recent or 2 points you received. Insofar as "neutral" that means thus far you have few points. At some number threshold that bumps up to the next level.
If you look at a member list, usually beside the user name is a green square containing the reputation points.
I believe members are only allowed to give 5 reputation points in a day.
All in all, I believe few members know about this and it is not used much.
Back in the old days of DirtyDog, he would start new members out with 10 points.
Ahh.......the trivia of the forum
Thanks for asking! I'll give you a point for that.