The sign you referred to is known as the "End of the priority road" sign. This sign indicates that you are leaving a road where vehicles have priority over others. When you see this sign, it means that you will no longer have right of way at intersections or when entering other roads; you must yield to vehicles on those roads.

This sign is typically used to inform drivers that they need to be cautious and prepared to stop or yield to traffic that does not have the same priority as they may have experienced on the previous road. It's important for ensuring safe driving in areas where road priorities change.

If you have any other questions about German traffic rules, feel free to ask!