The inner plate of the back of a steam-locomotive firebox.

in a flat panel display, for a panel that consists of two plates of glass (or substrates) bonded together, the plate farthest from the viewer of the display.

Piece of plate armour protecting the back half of the torso.

A metal stamping that is used to help affix certain closure products to the application. It is also another word for a washer.

(n.) A thin piece of metal, usually with a concave portion, used with machine screws to fasten certain types of cylinders to a door. Source: Lock Industry Standards and Training (LIST) Council

Used in some centrifugal pumps to position the stuffing box and provide an impeller wear surface.