This book is not about the meaning of the individual charges of Japanese heraldry. Its aim is to help the reader “blazon” Japanese Mon in their original language. While some books have given a cursory view of a few terms used to describe Mon, a thorough explanation has been missing. It is my goal to remedy this by providing as precise and exhaustive a list as possible. Moreover it is my belief that by mastering the concepts associated with the description of Mon it will be possible to design new ones respecting the spirit of Japanese heraldry.