Yakko Hi

Leading Hi. Yakko means 'leading man of a daimyo's precession line'. Hi in the gill area that is only seen on Asagi and Shusui. The term occurs because Koi with these markings resemble the face makeup of a leading man of a daimyo's precession line. Hi on both gills is called Ryo Yakko. Hi on one side is called Kata Yakko. The optimal Yakko Hi forms a horseshoe shaped pattern that has white in the middle.

(Courtesy of the excellent Book Kokugyo Vol II)