The sign you referred to is the Note Symbol 1010-11. This traffic sign indicates a "note" or "announcement" related to traffic dynamics or any specific situation that drivers should be aware of.

In general, this type of sign may be used to give information to drivers about important traffic updates, road conditions, or other pertinent notifications that may affect their journey. However, the details of the note are not specified by the sign itself and usually require additional context or a specific message related to the circumstances.

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