There is a vocabulary for code used for malicious or clandestine purposes. Terms include malware, virus, trojan-horse...
In a large IC with millions of transistors, it is feasible to produce a version with an additional small drop-in that can be exploited without any special software included in the host machine. These tiny additions are particularly difficult to detect without destructive deconstruction and mapping via electron or X-ray microscopy.
Is there are term for this class of hardware exploit?
I'm looking for something beyond "Fake IC" or "counterfeit IC", those presumably deceive the customer for reasons of profit, but wouldn't necessarily contain extra circuit layout for malicious or clandestine purposes.