Knocker

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Knocker

(n.) One who, or that which, knocks; specifically, an instrument, or kind of hammer, fastened to a door, to be used in seeking for admittance.
(n.) A person strikingly handsome, beautiful, or fine; one who wins admiration; a stunner.
(n.) A species of large cockroach, esp. Blabera gigantea, of semitropical America, which as able to produce a loud knocking sound.