MENTAL MODEL · M4387

Peirce's Trichotomy

CultureHigh supportPhilosophy

Included

Updated 2026-08-08

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INTRODUCTION

English translation pending.

CORE DEFINITION

Proposed by Charles Sanders Peirce as part of his semiotics. Signs divide into three kinds by how they relate to their objects: an icon resembles its object, as a photograph or a map does; an index is causally or physically connected to it, as smoke is to fire; and a symbol relates by convention, as words do. Peirce also placed an interpretant alongside sign and object, making meaning a three-part relation.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Pick the sign: choose icons for universal recognition, indices for evidential force, and symbols for depth - Test comprehension: ask which type of sign your audience can actually read - Layer the three: combine an icon, an index, and a symbol when a message must land across audiences

anchor

Anchor fast decisions

Each sign type works through a different relation, so each carries a different cognitive load. Icons require only recognition of resemblance, indices rely on an inference from cause to effect, and symbols require learned convention. Because symbols depend on shared codes, they carry more meaning but reach fewer people, which makes the choice among the three decisive.

MINIMUM ACTION

In progress 0/1

Practice this model in one real situation:

Identify whether a sign works by resemblance, causal connection, or convention. 2. Check which type your audience can read without training. 3. Choose icons for broad reach and symbols for depth. 4. Combine types when a message must work for more than one audience.

Check to track your progress (stored locally)

Learning progress0%

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Source support: Explicit

link
en.wikipedia.orghttps://en.wikipedia.org/wiki/Semiotic_theory_of_Charles_Sanders_PeirceZH · Explicit
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