Exotic matter

In physics, exotic matter is matter that somehow deviates from normal matter and has 'exotic' properties. A broader definition of exotic matter is any kind of non-baryonic matter—that is not made of baryons, the subatomic particles (such as protons and neutrons) of which ordinary matter is composed. Exotic mass has been considered a colloquial term for matters such as dark matter, negative mass, or complex mass.