The sign is a Guide Post on the right. In Germany, this sign indicates that there is a marker or guide post positioned on the right side of the road. These guide posts are often used to assist drivers in navigation, especially in rural areas or places where the road may be less defined. They help to delineate the roadway and can also indicate the line of travel or direct drivers toward specific routes or destinations.

If you have any more questions about German traffic rules or need help with something else, feel free to ask!