ABSTRACT:  The most of the theories of the sign involve either two or three elements. The main figures of the two models are Ferdinand de Saussure, in the case of the dyadic model, and Charles Peirce, in the case of the triadic model. Plato’s semiotics can be conceived starting to his ontology and epistemology. Taking into account the two theories of the sign forenamed, one can say that Plato’s semiotic model is triadic, having as its elements Idea, the word and the sensible thing. The analysis of the relationships between the three elements points out their status within Plato’s semiotics. The relationship between sensible thing and Idea can be made within platonic ontology, while the relationships between the word and Idea, respectively the word and the sensible thing can be analysed within Plato’s epistemology and gnoseology. According to Plato, the meaning becomes the object for theoretical knowledge and the meaningless knowledge is equivalent to the knowledge lacked by the theoretical base. pp. 35–44

Keywords: Plato’s semiotics, triadic model, Idea, knowledge, opinion

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