There are several synonyms for the term "custom license plate". The first is "vanity plate," which refers to a personalized license plate that displays a customized message chosen by the driver. Another synonym for custom license plates is "personalized plates," which typically feature a combination of letters and numbers chosen by the driver. "Specialty plates" are another related term, which can refer to custom plates that are designed specifically for a certain group or organization, such as military veterans, alumni associations, or sports teams. Ultimately, no matter what you call them, custom license plates offer drivers a unique and personalized way to express themselves on the road.