The semiotic theory of Charles Sanders Peirce describes three distinct categories of signs: icons, indexes and symbols.

References

* Jonathan A. Smith,

Horace Romano Harré Quintus Horatius Flaccus (; 8 December 65 – 27 November 8 BC), known in the English-speaking world as Horace (), was the leading Roman lyric poet during the time of Augustus (also known as Octavian). The rhetorician Quintilian regarded his '' ...

, Luk Van Langenhove (eds.), ''Rethinking Psychology, Volume 1'', SAGE, 1995, p. 114. Semiotics Theories of language Symbols {{semiotics-stub