Japanese Naval Signal Flag #9—Code "Kokono" 最初の9の日本の海軍艦隊信号-名前「ここの」

The Japanese Maritime Flag for the Number Nine composed of three colours: blue, white, and red.  A white diagonal tilted from the bottom to the top, near the hoist to fly is white.  This white bottom-top diagonal separates a blue triangular field on the hoist and red triangular field on the fly.

 This is page taken from a Japanese Signal flag book.  Japanese Auxiliary Number Flags were used in combination with International Maritime Flags.

The codes with Kokono are highlighted.

 Below is an image of the Signal Flag Cache from the Japanese Maritime Self Defense Forces.