This is the emblem of the Commonwealth, it features the nightside of Terrius, with the pheonix over it. The pheonix symbolizes the Commonwealths history as they rebuilt humanity after the War of terra and moved on to Terrius from the fragmented stations littering the solar system and the asteroid belt, with the Commonwealth motto at the bottom "Ex cineribus, resurgimus" which is latin for, "From the ashes we rise". We also see Strellius and Rollius infront of terrius, as well as Terrius's moon at the bottom. Due to this, the most elite branch of the Commonwealth military is named: "The Pheonix Corps" and they have access to top notch military tech, and even blueprints are being drawn for an anti-matter cannon cruiser for the Pheonix corps.
Don't be hard on me pls, biological lifeforms were never my strong point in art, machine is.