Door knocker

All you want to know about Door knocker

Door knocker in Florence, Italy.

Doorknob as a piece of art, Palazzo Pandolfini in Florence, Italy

A British cast iron door knocker designed and sold by Lumley Designs

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) attached to it by a hinge that may be lifted and used to strike a plate fitted to the door, or the door itself, making a noise. The struck plate, if present, would be supplied and fitted with the knocker.

Door knockers are often ornate, but may be no more than a simple fitting with a metal bob or ring.