Both a sophisticated and ultimately disposable piece of spycraft, and the name of the profession of the people who use them.
A class of cybernetic prosthetics worn over the face
A strange mask containing a merciless demon, a parasite on those around it.
Orcs record their deeds through symbolic mutilation, scarring and tattoo. Perhaps creating the medium of skin as art, which humans followed later. Perhaps tattoos remind the elves of orcs and make them angry...