Memristor
conceptual passive electric dipole with varying yet persistent resistance / From Wikipedia, the free encyclopedia
A memristor, or memory resistor, is described as one of the basic elements (resistor, capacitor, inductor) of electronic circuits, because it can’t be replaced by any combination of these elements.
A memristor can change its resistivity according to the voltage, but even after disconnection it remembers resistivity for unlimited time. It can work like analog memory or a resistive switch, which can have an infinite number of states.