Black and White Diagonal Naval Flag

1. In maritime contexts, a black and white diagonally divided flag is often associated with the International Code of Signals (ICS). Specifically, this resembles the "Lima" (L) signal flag when displayed in certain color schemes.

   Meaning in Naval Use:

   • In the International Code of Signals, the Lima flag is yellow and black, but in some contexts (such as racing or local adaptations), black and white versions may be used.
   • In naval and port operations, the Lima flag means: "You should stop your vessel immediately" or "A ship is under quarantine" depending on context.
   • In diving contexts, a black-and-white diagonally split flag can also be used to mark certain zones or indicate restricted areas.

   Note: The exact meaning can vary depending on the organization, country, or specific maritime activity, so its important to confirm with the relevant local maritime authority.