Most Japanese families have a coat of arms. Yamaguchi is the strongest yakuza group (according to wikipedia, it would be around 55000 members), and has a specif

Most Japanese families have a coat of arms. Yamaguchi is the strongest yakuza group (according to wikipedia, it would be around 55000 members), and has a specific daimon: http://en.wikipedia.org/wiki/File:Yamabishi.svg.　hishigata http://en.wikipedia.org/wiki/File:Yamabishi.svg.　hishigata means diamond shape.