Not only the purpose of a door knocker is to allow a guest the opportunity to announce his presence but it has a symbolic meaning too . Door knockers may be simple pragmatic objects, whose design was simple and utilitarian but it was more often a visual object that possessed symbolic value in addition to its practical purpose. The symbolism is most often related to the acts of welcoming guests and protecting the home. Thus one fond such motifs as the pineapple that has traditionally been associated with hospitality and prosperity. Many other motifs cans be found such as Lion, Dolphins, Dragon etc.. ( See our article about door lockers symbols.) Over the time doors knockers have become more and more a symbol of the social standing of the house.
The first material that was used for making door knocker was iron, first wrought iron and later cast-iron. In the 19th and 20th c. brass door knockers became more and more popular because of their lower cost of fabrication. Door Knockers can be classified in four broad categories: