What is the symbolic meaning of two birds circling in the sky?

The clearest answer to this is that sailors would get a sparrow on each shoulder for crossing both the Atlantic and Pacific Oceans respectively. Also, sailors would often get a sparrow for every 5,000 nautical miles traveled. They also were to serve as good luck so sailors would get them for this purpose before leaving dock sometimes. Today, they usually mean nothing and are selected mainly for their classic design. They sometimes can symbolize the passing of a loved one. All depends.