Displayed are Raúl Aguayo-Krauthausen (on the left) and Carola Rackete (on the right).
Krauthausen is known for his disabilitiy rights activism and Rackete is known for her environmental activism and for sailing with the Sea Watch 3.
https://de.wikipedia.org/wiki/Systematik_der_Kraftfahrzeugkennzeichen_%28Belgien%29?wprov=sfla1
Belgian license plates are tied to vehicles. They also can't be traced back to a province. Despite that, Belgian license plates have a meaning. Simply to collect them, it would be enough to color the entire country red on the map proportionate to the progress...
CD-... → Diplomatic vehicle TX-... → Taxi O-... → Classic car Z-... → Dealer plate M-... → Motorcycles Q-... → Trailer