Not only in medicine but also in Japanese historical linguistics and calligraphy it has been regarded as highly important, since it includes declensional kana endings and reading guides in the Heian and Kamakura periods.
医学のみならず、平安・鎌倉時代の送りカナ・ヲコト点がついているため、国語学史・書道史上からも重要視されている。