Wikipedia
A benistor is a controllable electron valve capable to independently manage the amount of voltage and current between generator and load in an electrical circuit. The benistor is able to modulate the value of any or all of following parameters delivered to a load: maximum voltage, effective voltage, average voltage, maximum current, effective current, or average current. The benistor achieves this modulation by means of several voltage and current control terminals. The benistor’s capability to operate in linear, switching, or self-switching mode of operation, controlling the voltage amount on the vertical axis and the current amount on the horizontal axis (see oscilloscope waveforms), makes it an extremely versatile control device for power management applications, especially for circuits involving non-linear loads, such as LED (Light Emitting Diode) power converters (drivers).