The traffic sign you mentioned is known as "Tourist information with reference target." This sign indicates that there is tourist information available nearby, directing drivers to the nearest location where they can obtain more details about local attractions, services, or accommodations.

Typically, these signs are placed on roads leading to areas of interest or in regions popular with visitors to assist them in finding helpful information to enhance their travels. It encourages safe and informed exploration of the area.

If you have more questions about German traffic rules or need assistance with other traffic signs, feel free to ask!