@K.:
! http://i1.mangareader.net/one-piece/818/one-piece-7169083.jpg
Does the symbol on top of the poneglyph represent an old alliance between tribes/countries/races?
If so, The bird would be the Kozuki Clan, the 9 circles could be humans and moon people, not sure what the flower/clouds and the four tails that represents the Fishmen.
As always, overthinking is what I do.
Just to take into consideration: If this is not a geocentric model, the planet has 8 moons, 9 technically with the satellite of the moon, but just a thought.
! https://static.comicvine.com/uploads/original/11117/111171443/5226614-3574587728-latest
For what it's worth, the Mino-based Mori clan's mon (Not the one from Chugoku) was about the same exact thing.