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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 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. They are commonly used in apartment buildings.

Morocco (Arabic: المغرب‎ al-Maghrib ; Berber: ⵍⵎⴰⵖⵔⵉⴱ Lmaɣrib), officially the Kingdom of Morocco (Arabic: المملكة المغربية‎ al-Mamlaka al-Maghribiyya:  pronunciation (help·info); Berber: ⵜⴰⴳⵍⴷⵉⵜ ⵏ ⵍⵎⴰⵖⵔⵉⴱ Tagldit n Lmaɣrib), is a country located in North Africa. It has a population of more than 35 million and an area of 710,850 km², and also primarily administers the disputed region of the Western Sahara. It is part of the Maghreb region, in addition to Tunisia, Algeria, Mauritania, and Libya, with which it shares cultural, historical and linguistic ties.

Morocco is a constitutional monarchy with an elected parliament. The King of Morocco holds vast executive powers, including the possibility of dissolving the parliament. Executive power is exercised by the government but more importantly by the king himself. Legislative power is vested in both the government and the two chambers of parliament, the Assembly of Representatives and the Assembly of Councillors. The king can also issue decrees called dahirs which have the force of law. Parliamentary elections were held in Morocco on 7 September 2007, and were considered by some neutral observers to be mostly free and fair; although voter turnout was estimated to be 37%, the lowest in decades. The political capital is Rabat, and the largest city is Casablanca; other large cities include Marrakesh, Tetouan, Tangier, Salé, Fes, Agadir, Meknes and Oujda.

Door furniture (British and Australian English) or Door hardware (North American English) refers to any of the items that are attached to a door or a drawer to enhance its functionality or appearance.

Design of door furniture is an issue to disabled persons who might have difficulty opening or using some kinds of door, and to specialists in interior design as well as those usability professionals which often take their didactic examples from door furniture design and use.

Items of door furniture fall into several categories, described below.