The sign you referred to is known as "Sign Symbol 1010-57." This sign indicates a "crossroad with priority" or "priority road ahead."

According to German traffic laws, this sign informs drivers that they are approaching an intersection where they have the right of way. Drivers on the road marked by this sign do not need to yield to traffic coming from other roads unless otherwise indicated by additional signs. It is crucial to remain vigilant, as other drivers may not have the same right of way.

If you have any further questions about this sign or other traffic rules, feel free to ask!