Biorhythm compatibility represent the chances of having the same mood in the same time.
On a physical level for example biorhythms compatibility of two people will show that they will have simultaneously a high physical level, they will be able to synchronize better. Likewise, the emotional or intellectual.
In couple relations is very important to synchronize on an emotional level so that both persons need to be close to the partner at the same time. The most important professional relationships is to have physical and mental synchronization.
This synchronization of biorhythms is not showing the attraction between two people, not show the actual compatibility but is more about that feeling of being on the same "wavelength".