The sign you mentioned is the "Other Restrictions" sign (1053-36) in German traffic regulations. This sign indicates that there are specific restrictions in place that are not covered by other standard signs. It usually serves as a notice for drivers that different rules apply in the area, such as limitations related to types of vehicles, times when certain rules are in effect, or other particular traffic conditions.

When you see this sign, it is essential to pay attention to additional information provided on the sign or via supplementary signs nearby, as they will clarify the exact nature of the restrictions. Always follow these guidelines to ensure compliance with local traffic laws and regulations.