From left to right, the doors facing the residential units are 1 unit and unit 2. Entering the unit door, the rooms are 10 1, 102, 103 from left to right respectively. ......

In addition, for administrative street numbers, Lunan is generally a double number, Lubei is a single number, Ludong is a double number, and Luxi is a single number.

House number, also known as house number or household number plate, refers to the identification card fixed at the door of the household to indicate the number of the household. If it is a villa number plate, some will also indicate that the household is named after the house. The floor number is usually displayed on the house number, such as 20 1, which means the second floor 1 room. Door number plate, building number plate, unit number plate, floor number plate and fire number plate all belong to building identification plates. Every new multi-storey and high-rise building should have a building logo. When a building is accepted, it can't pass the acceptance without building signs.

References:

Door number plate-Baidu encyclopedia