backplate

1. A plate protecting a fighting person's back.

   plate armor protecting the back; worn as part of a cuirass

2. A plate harnessed to a diver's back, to which the gas cylinders are attached.

3. The metal plate on the rear of a computer's casing, where the ports are found.

4. A wood or metal (or glass, etc) plate that serves as a backing for an object.

5. (Британія)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.

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