The doorplate and floor plate are the legal signs and address codes of urban unit courtyards, residents' courtyards, bungalows and buildings set up by civil affairs departments in accordance with the requirements of scientific management of geographical names.
House number refers to the sign nailed to the door to indicate the street name and house number. With the house number, people can easily know where they are going, manage a jurisdiction better, and facilitate the accurate delivery of express mail and letters.