 There have been many types of Asahi flags since ancient times, and the design in which light rays spread in all directions without clouds expresses Halle, and was a design that was used for emphasizing the goodness of the economy, festiveness, and the good economy at the time of Keiji etc.A well-known variant of the flag of the sun disc design is the sun disc with 16 red rays in a Siemens star formation.The has been used as a traditional national symbol of Japan since at least the Edo period (1603 CE).