Another possibility is that the center is a significator of sorts, representing someone or something. The rest are connections to archetypes represented symbolically.
Since it came from an entity, of sorts, through your friend's UPG experience, then your friend's best bet to find its meaning is to contact the entity and ask.
There is also the possibility that the symbols and shapes involved have some subconscious meaning to your friend. So again, your friend would have to figure that out.