On Friday i saw a rare "BW"-number plate. This does neither mean Bundeswehr (german military, they use the letter Y) nor Baden-Württemberg (their police have BWL). I was also confused because the car didnt look military. So i googled it and found out that it is reserved for marine management companies. It also had the WISAG company logo.

Here is a sample image so that you know how it looks. I didnt take it so only the link:

http://www.ub-feuerwehr.com/resources/D.+BW+6+-+780+hinten.JPG

BW number plate is very rare, as most marine companies use ordinary plates.