The sign you are referring to is a Gas station with natural gas. This sign indicates the location of a gas station that provides natural gas (CNG - compressed natural gas) as a fuel option for vehicles.

In Germany, this sign is important for drivers with vehicles equipped to run on natural gas, as it helps them locate refueling stations that meet their needs. Natural gas is often used as a cleaner alternative to traditional petrol and diesel fuels, contributing to reduced emissions.

If you have any more questions or need further clarification about driving rules or other traffic signs, feel free to ask!