The term 'Tenno Amishima' (described as 天網島 in Chinese characters) was created by combining a proverb, 'Tenmo kaikai' (the evil never fails to be punished) (described as 天網恢恢 in Chinese characters), with a place of love suicide, Amishima (described as 網島 in Chinese characters).
「天網島」とは、「天網恢恢」という諺と、心中の場所である網島とを結びつけた語。