The letter J for the Composite Semaphore flag has a white background and black contrast indicator that mimics the would be normal flag signaling position for J in Semaphore signaling. It is white bacause J is the 10th letter and the ones digit value codes for the background, and zero is coded to white, while its contrast indicator is black. The stars indicates the right arm, which is the starboard-right side of a person or ship.
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