 This is a trichotomy with which we are already familiar from the early account, and indeed, the examples of icons, indices, and symbols are largely the same as before: icons are portraits and paintings, indices are natural and causal signs, symbols are words and so on. There are, however, additional instances, for example, icons include diagrams used in geometrical reasoning, indices include pointing fingers and proper names, and symbols including broad speech acts like assertion and judgment, all of which suggests a considerable broadening of this trichotomy. It is well worth noting, though, that by 1903 Peirce was aware that it would be hard, if not impossible, to find any pure instances of icons and indices. Rather, he began to suspect that icons and indices were always partly symbolic or conventional. To try to capture this, Peirce experimented with some additional terminology and types of icon and index. These he called the hypo-icon (see CP2 .276 1903) and the sub-index (see CP 2.330 1903) respectively. We shall not explore these signs further here (see (Goudge 1965) and (Atkin 2005) for more on Peirce’s view of indices, and (Legg 2008) for more on icons), but it is worth noting that by 1903, the simple icon/index/symbol trichotomy was something of an abstraction, and Peirce was aware that any single sign may display some combination of iconic, indexical and symbolic characteristics.