A philosophical zombie or p-zombie in the philosophy of mind and perception is a hypothetical being that is indistinguishable from a normal human being except in that it lacks conscious experience, qualia, or sentience.
The unifying idea of the zombie is of a human that has no conscious experience, but one might distinguish various types of zombie used in different thought experiments as follows:
A behavioral zombie that is behaviorally indistinguishable from a human. A neurological zombie that has a human brain and is generally physiologically indistinguishable from a human. A soulless zombie that lacks a "soul."