International maritime signal flags refers to various flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals. Various navies have flag systems with additional flags and codes, and other flags are used in special uses, or have historical significance. Wikipedia

(No ICS meaning as a single flag). Distance (range) in nautical miles.

Single Flag Meaning: It has no specific alphabetical meaning by itself.

Naval Meaning: Used in naval contexts to signal "Preparing to replenish (at sea)". When flown "at the dip" (halfway up the mast), it indicates a ship is preparing for an underway replenishment.