Adapted from a conversation with Claude AI

Peirce’s Semiotics

Core structure: the triadic sign

Charles Sanders Peirce’s theory of signs is triadic, in contrast to Saussure’s more familiar dyadic model (signifier/signified). For Peirce, a sign only functions through three interlocking parts:

• Representamen — the sign-vehicle itself: the word, image, sound, or object that does the signifying.
• Object — what the sign refers to.
• Interpretant — the understanding or effect the sign produces in a mind. Not the interpreting person, but the mental sign generated by encountering the first sign. Crucially, the interpretant is itself capable of becoming a new representamen, triggering further interpretants — semiosis chains outward rather than terminating in a fixed meaning.

Three sign types (by relation to object)

• Icon — resembles the object (a portrait, a map, an onomatopoeic word).
• Index — is causally or physically connected to the object (smoke indicating fire, a weathervane indicating wind direction, a pointing finger).
• Symbol — connects to the object only by convention or habit (most words in a language — “tree” doesn’t resemble or physically connect to a tree; it works because speakers agree it does).

Why it matters (vs. Saussure)

Saussure’s model brackets meaning as a relatively fixed relation between two terms sitting in a code (langue). Peirce keeps the interpreting mind structurally inside the sign relation — meaning is generated through an ongoing interpretive process, not just decoded. This is part of why Peirce came out of logic and pragmatism rather than linguistics: he and Saussure worked out their sign theories independently around the same era, but 20th-century “semiotics” as it filtered into literary theory and the humanities leaned heavily Saussurean/structuralist, leaving Peirce’s triadic version more of a philosophy-and-logic thread.

Possible connection: icon/index/symbol and iconographic theology

The icon/index/symbol distinction has real echoes in patristic and Byzantine theorizing of icons — icons framed as participating in what they depict, not merely resembling it.

[Worth its own note if this gets developed further; it’s a genuinely different claim than “symbol” makes in Peirce’s scheme.]

Further reading

• Umberto Eco — the natural bridge; explicitly builds on Peirce (not Saussure).
• A Theory of Semiotics — Eco’s systematic treatment of sign theory.
• Semiotics and the Philosophy of Language — shorter, deals directly with the Peirce/structuralism split.
• Kant and the Platypus — denser, closer to Eco’s semiotics-proper register; concerned with how we cognize and categorize something (the platypus, defying the mammal schema) before a settled concept exists — a very Peircean problem (representamen/interpretant machinery at work before classification is stable).
• The Name of the Rose — William of Baskerville’s method is essentially Peircean abduction: reading tracks, ash, and marginalia as indexical signs and reasoning backward to causes.
• Foucault’s Pendulum — closer sibling to Name of the Rose in narrative pull, denser, more conspiracy-shaped.
• The Island of the Day Before — more meditative/essayistic, less genre scaffolding; a common bounce-off point.
• Peirce primary sources — scattered across his Collected Papers; no single unified “book” on semiotics from Peirce himself, since his sign theory developed across essays and manuscripts over decades.

Open threads

• Develop the icon/index/symbol ↔ Byzantine iconography connection
• Consider Kant and the Platypus as next Eco read (already on shelf, unopened)