Before this, cars were registered under PK.
The letter B was given to Selangor as it was the second state to register car ownership, followed by Pahang which was given the letter C and then Kelantan, where the plates would begin with the letter D.
Subsequently, vehicle plates were based on the initial letter of each state such as J for Johor, K for Kedah and M for Melaka.
Perlis had to settle for an R as P was already taken up by Penang. For Kuala Lumpur, the first series was given the letter W but since July 2016, it has changed to V.
Sabah got an S but this was only after 1963.
Before this, plates in Sabah began with E.
The letter Q was given to Sarawak at the same time.
Before this, its plates were distinguished by a number and then a D to denote the five administrative divisions followed by a number sequence.