A door knocker is an item of door furniture that allows people outside a house to alert those inside to their presence. A door knocker has a part fixed to the door, and a part (usually metal) which is attached to the door by a hinge, and may be lifted and used to strike a plate fitted to the door, or the door itself, making a noise. The struck pla...
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http://en.wikipedia.org/wiki/Door_knocker
The door knocker was the German nickname for their own 37 mm Pak 35 infantry anti-tank gun, so called after 1940 because of its ineffectiveness against allied armour.
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http://www.probertencyclopaedia.com/browse/FYD.HTM
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