doorknocker n. A device (usually metal and ornamental) attached by a hinge to a door, which may be swung by hand against the door to make a loud knocking sound.
... beauty of his neck-cloth half-achieved, while he listened with surprise and indignation upon his large, comely, fresh-complexioned face. Below, the decorous hum of Jermyn Street had been broken by the sharp, staccato, metallic beating of a doorknocker. ... — Danger! and Other Stories • Arthur Conan Doyle
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