What does this traffic sign indicate?

This traffic sign indicates a hydrogen filling station. It shows a fuel pump symbol with "H2," which stands for hydrogen. In Germany, this sign is used to inform drivers about the availability of hydrogen as a fuel option, typically for hydrogen-powered vehicles.

The other options—natural gas fuel station and auto gas filling station—have different specific signs or labels. Hydrogen stations are still less common, so this sign is important for drivers of hydrogen vehicles to recognize.

Your answer was correct because you identified the sign as indicating a hydrogen filling station, which matches the "H2" chemical symbol shown. Recognizing fuel station signs with chemical symbols or abbreviations is helpful for understanding alternative fuel options on German roads.