A "House Number" is a unique identifier assigned to a specific building or residence within a street or area. It helps in locating properties and is essential for mail delivery, emergency services, and navigation. House numbers are typically displayed on the exterior of a building, often near the front door or on a mailbox. House numbers are usually part of a larger addressing system that includes the street name and city. They can vary in format, with some areas using sequential numbers while others may have odd and even numbers on opposite sides of the street. Properly displayed house numbers ensure efficient communication and service delivery.