The design’s bits and pieces described are as follows:
The stars represent each of the members of the Enclave council, which there are 9 of them. The last star to complete the circle would be that of Cloudsdale, which was notoriously lost during the War, and thus an empty space is kept there to remind why the pegasi must stand together.
Wings represent the pegasi themselves, and also refer to their old banner from pre-Equestrian times. They “guard and embrace” the 9 stars, symbolizing the Enclave’s priority to the Pegasi