The sign you referred to is a Pedestrian Crossing sign. In Germany, this sign is usually a blue square with a white symbol of a person walking.

The meaning of this sign is to indicate a designated area where pedestrians are allowed to cross the road. Motorists are required to yield the right of way to pedestrians who are on or approaching this crossing. It serves as a warning for drivers to be vigilant and reduce speed, as pedestrians may be present or about to enter the crossing.

Pedestrian crossings are vital for ensuring the safety of people walking, especially in areas with high foot traffic. Always observe the behavior of pedestrians near these crossings, and be prepared to stop if necessary.