There are various methods that the flags can be used as signals:
* each flag spells out an alphabetic message, letter by letter.
* individual flags have specific and standard meanings; for example, diving support vessels raise the "A flag" indicating their inability to move from their current location because they have a diver underwater.
* one or more flags form a code word whose meaning can be looked up in a code book held by both parties.
I have to admit I had no idea what these flags were saying, I just liked the colors. According to fellow Etsian, cptnruthless, the flags say "welcome".
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