This treatise, as a part of a study of European typefaces, is to take the problems on classification of typefaces in consideration. It is a study on the typeface called the "TUSCAN Letter", and is to consider what typeface the "TUSCAN Letter" is, the derivation of its appellation, its formal feature, and comparison concerning form with other typefaces. Hitherto this name, the "TUSCAN Letter", has not been used in Japan and it is indefinite as regards classification, therefore, upon this, by presenting the "TUSCAN Letter" as Japanese appellation I wish to arouse attention and consideration among knowledgeable people.