 This, then, is the very first outing for Peirce’s famous division of signs into Icons, Indexes, and Symbols. Although Peirce’s precise thoughts about the nature of this division were to change at various points in his development of sign theory, the division nonetheless remains throughout his work. There are, however, some important features to this early account that mark it out from the later developments. We shall look at two of these features here: the importance of thought-signs; and infinite semiosis.