Ideas from 'Logic as Semiotic: Theory of Signs' by Charles Sanders Peirce [1897], by Theme Structure

[found in 'Philosophical Writings of Peirce' by Peirce,Charles Sanders (ed/tr Buchler,Justus) [Dover 1940,0-486-20217-8]].

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19. Language / C. Reference / 1. Reference theories
Icons resemble their subject, an index is a natural sign, and symbols are conventional