It is a metallic element that is placed on the doors externally. It is also often called a doorknob or caller. In Colombia it was commonly used many years ago. We also used to say aldaba to a metallic element that was used internally as a bolt or pin. In both cases they are already little used elements and are only found in old buildings. The term is of Arabic origin.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list