Nanites

Nanites are microscopic, insectoid machines installed in Ærolith Dynamics' employees as part of the hiring process.

While they are small enough to be invisible to the naked eye, they can be seen under a microscope, and can be manipulated either with code or with low-intensity magnetic fields. Their primary function is to provide biometric information about their resident, although some artificial intelligences are also able to interact with them remotely, to be installed there directly, or to take up residence there temporarily.