The

semiotic theory of Charles Sanders Peirce Charles Sanders Peirce began writing on semiotics, which he also called semeiotics, meaning the philosophical study of signs, in the 1860s, around the time that he devised his system of three categories. During the 20th century, the term "semiot ...

describes three distinct categories of signs: icons, indexes and symbols.

References

* Jonathan A. Smith, Horace Romano Harré, Luk Van Langenhove (eds.), ''Rethinking Psychology, Volume 1'', SAGE, 1995, p. 114. Semiotics Theories of language Symbols {{semiotics-stub