That is a special modification to the board.

It shows how much the profiles have been completed, but that is not all:
Members that do not complete their own profiles will not be able to see the profiles of other members that took the time to complete their own profiles.

It is a special modification to the star ratings and was written by JoshPet. JoshPet is a threads hacker, in the good sense, that will be helping us with the boards from now on...