Any small device that plugs into an electronic device, typically a computer, and alters its functionality. Common examples include wireless modems, digital media players, software copy protect devices, and adapters.
A hardware device utilized by a specific application for purposes of copy protection.
A device that converts alternating current into direct current; often a diode.
The activation function f(x)= max (0,x), where x is the input to a neuron.
An instrument used for determining and rectifying the variations of the compass on board ship.
Something that rectifies.