They call centers, and based on indian chacras. In this metodics there is explanation for that - before 1751 there was only 7 chacras people and this was described in indian astrology and yoga stuff, but after this year start born people with 9 chacras. One center was splitted in two (didnt remeber wich one)

So now we have 9 centers: head, root, ajna, throat, g/self, hear, solar plexus, spleen, sacral.

on profile on http://hd.dating/hd/me there is text describing behaviors of this center if it difined (colored) or undefined (white)