Paars Tablet

This carbon-based device is lighter than it looks, and features a symbol which resembles a 'U', lit up in purple. Despite the onboard power still functioning, algae growth on the exterior indicates it was abandoned hundreds, perhaps thousands of years ago. While the technology is far beyond federation levels, and there is no obvious way to interface with it, it should nonetheless be possible to fabricate a precise physical copy of the device, if necessary.