In Germany the license plate have this structure XX-X 000. The first 1 till three Letters behind the hyphen belong to the town where you live. So if you know which letters belong to your city, you also know which letter after the hyphen you should avoid, as the combination of those letters may create a word or a pseudo-word which might look weird on your car. And yes you can choose the letters and numbers(as long as that combination is unused) after the hyphen.
In this case the car is a Saab 9-3 TurboX sedan, and the car is registered in Düren, which has the letter-code DN.
Which 3rd letter is on the license plate?
Solution after the jump.
Did Not Finish
It is not the coolest word for a TurboX, is it ?