backplate

Noun

 * 1) A plate protecting a fighting person's back.
 * 2)  A plate harnessed to a diver's back, to which the gas cylinders are attached.
 * 3) A metal plate on the rear of a computer's casing, used to cover a port or slot.
 * 4) A wood or metal (or glass, etc) plate that serves as a backing for an object.
 * 5)  A rigid metal plate inside the brake drum, which supports the wheel cylinder, brake shoes, and other parts of a drum brake.
 * 6) Part of a condenser microphone that sits behind the diaphragm and which acts, in conjunction with the diaphragm, as a sort of variable capacitor.
 * 1) Part of a condenser microphone that sits behind the diaphragm and which acts, in conjunction with the diaphragm, as a sort of variable capacitor.