The Person ID Number (PID) is an identification number assigned to all persons with a university relationship, as defined by an official university department. This number is designed to give all persons a universal number (PID or Person ID) that is unique to the University of North Carolina at Chapel Hill. The number is nine-digits long and replaces all existing card numbers previously used on campus. The PID is the primary record keeping key for all departments within the university and must be used for all communication.