A Numbering Plan is a systematic approach used to assign unique identifiers, such as phone numbers or postal codes, to facilitate communication and organization. It ensures that each number is distinct, preventing confusion and errors in routing calls or delivering mail. In telecommunications, a numbering plan helps manage the allocation of numbers within a specific region or service provider. For example, the North American Numbering Plan (NANP) organizes phone numbers into area codes and local exchanges, making it easier for users to connect with one another efficiently.