What does this traffic sign indicate?

The traffic sign indicates a natural gas fuel station (CNG - Compressed Natural Gas). It is important for drivers of vehicles that run on natural gas to know where they can refuel. The sign helps in locating facilities that provide this type of fueling option. Understanding this sign is crucial for ensuring that drivers of CNG vehicles can plan their routes effectively and avoid running out of fuel. In Germany, recognizing such signs is part of safe and informed driving practices.