Alien Carving

The Alien Carving is a relic composed of an unknown natural fiber that greatly resembles the yin-yang symbol of Earth, 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 Translator Device, the former theory is the most likely.