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Each modern Japanese prefecture has a unique flag, most often a bicolour geometric highly stylised design, often incorporating the characters of the Japanese writing system and resembling minimalistic company logos.[1] The heraldic badges worn by warriors in medieval Japan (mon) were forerunners of the modern emblems used in the prefectural flags.[2]
A distinct feature of these flags is that they use a palette of colours not usually found in flags, including orange, purple, aquamarine and brown.
Some prefectures also have alternative official flags called "symbol flags" (シンボル旗). They may be used on less formal occasions. Famous symbol flags include the one used in Tokyo.
A six-rayed stylised sun with a dot in the center. The background color is Edo purple (江戸紫, Edo murasaki), which was popular in Edo, the name of Tokyo during the Edo period. This shade of purple is one of the traditional colors of Japan, and is near identical to Web Indigo.
September 30, 1989
A stylised vivid green Ginkgo biloba leaf. The symbol consists of three arcs combined to resemble a leaf of the ginkgo, the metropolitan tree, and represents T for Tokyo. Created by Rei Yoshimura (レイ吉村), a professional graphic designer.