The sign you mentioned is known as "Oncoming Traffic." This traffic sign indicates that vehicles coming from the opposite direction may be on your side of the road. It serves as a warning to drivers to be cautious of oncoming vehicles, especially in areas where the road may be narrow or where passing is not allowed.

In Germany, this sign is typically found on streets that have single carriageways or in areas where there may be cars parked along the side of the road, reducing the available space for oncoming traffic. When you see this sign, you should be prepared to yield or take necessary precautions to avoid a collision with oncoming vehicles.

Always pay attention to your surroundings when you see this sign and be ready to adjust your speed or position as needed. If you have any further questions about traffic rules or need clarification on anything else, feel free to ask!