What is dd on license?

In some driving licenses, the abbreviation "DD" may stand for "Driver's Disability". This designation is typically used to indicate that the license holder has a physical or mental disability that may affect their ability to drive safely. License holders with a DD designation may be subject to certain restrictions or conditions, such as limitations on the type of vehicle they are allowed to drive or requirements for adaptive equipment. This designation is meant to ensure the safety of both the license holder and other road users.