The sign you are referring to is the "Floor plan" sign. In the context of German traffic laws, this sign indicates the layout of a building or an area, typically showing important facilities within a complex, such as restrooms, exits, or service areas. It is usually found in places like shopping malls, sports arenas, or large public buildings.

The purpose of this sign is to help people navigate the space more easily, so they can find the locations they need. Understanding these signs can be useful for drivers and pedestrians alike, as they may need to access various services while on the road or visiting a specific area.

If you have additional questions or need clarification on a specific topic regarding German traffic rules, feel free to ask!