The Commens Dictionary
Quote from ‘Definitions for Baldwin's Dictionary [R]’
An icon is a representamen which refers to its object merely because it resembles, or is analogous to, that object. Such is a photograph, a figure in geometry, or an algebraical array of symbols which by virtue of the “rules,” or permissions to transform, […] are analogous to the objects they represent. An icon is so independent of its object, that it is immaterial whether the latter exists or not.
MS [R] 1147
‘Icon’ (pub. 10.08.17-14:46). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-definitions-baldwins-dictionary-r-7.