What does a red dot signify in postal terms?

In postal terms, a red dot signifies that a house is vacant. This color-coding system is used by postal workers to easily identify homes that do not have current occupants, allowing them to manage their routes more effectively. When carriers see a red dot on their delivery list or map, they understand that they should not attempt delivery to that address, as there is no one available to receive the mail.

Understanding this indicator helps to ensure that mail is handled appropriately, avoiding unnecessary attempts to deliver items to locations where nobody is available to receive them. It also facilitates more accurate record-keeping, as carriers can note that the address is vacant rather than assuming the absence of delivery is due to any other reasons.