Alien Carving

The Alien Carving is a relic composed of an unknown natural fiber and is hundreds of thousands of years old. The shape greatly resembles the yin-yang symbol of Earth and it is found in the Primary Containment Facility. It is thought that this may have been due to the Precursor Race themselves having influenced ancient Chinese philosophy, or perhaps that the yin-yang has been independently invented by multiple species.

Given that the Precursors are known to have visited Earth and taken the Ancient Earth Blade, as well as multiple ancient Earth languages being stored on the Translation Device, the former theory is the most likely.