Any discussion on the index, no matter the context, must at some point refer to the writings of C.S. Peirce who, as I noted in my first post on the index, outlined three principle types of sign: likeness (icon), indication (index), and symbol. To recapitulate: an icon is a sign that conveys an idea of the thing it represents simply by imitating it (as in a drawing), an index is a sign that shows something about its referent on account of being physically connected to it (as in a footprint), and a symbol is a sign that has come to be associated with its meaning by usage (as in words). [1] Continue reading