“Peirce characteristically begins not with the classification of signs as promised—Icon, Index, and Symbol—but with his cenopythagorean categories which, in Quaker style, he had named Firstness, Secondness, Thirdness. They were the modes of being [Latour], ways that both ideas and things exist in the world, and though the analysis of just how they are related involves Peirce in noting degrees and reciprocities which must be named and adjusted, he manages to proclaim more than once that for his ideoscopy, it is Thirdness which is all-important, chiefly because it allows him to define a sign: ‘A Third is something which brings a First into relation to a second…A sign is a sort of Third…A sign is something by knowing which, we know something more (S. and S., p. 31)'” (59). **The third is the mediator/mediation/relationality. It is relationality emerging/formationing into being.
Berthoff, Ann E. “What Works? How do we Know?” Journal of Basic Writing 12.2 (1993) 3–17.
Berthoff, Ann E. “Rhetoric as hermeneutic.” College composition and communication 42.3 (1991): 279-287.
Berthoff, Ann E. “Sapir and the Two Tasks of Language.” Semiotica, vol. 71, no. 1/2, Sept. 1988, pp. 1-47.