Dalālah is the broader idea: knowledge of one thing leads to another. Waḍʿ is one particular basis for it: a sign has been assigned to a meaning.
Example 1: Hearing “book” and grasping its meaning relies on linguistic convention.
Example 2: Seeing smoke and inferring fire relies on a rational connection; no one named fire by assigning it the sign of smoke.
Every conventional indication is an indication, but not every indication is conventional.
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The difference between indication and convention
Dalālah, Waḍʿ and the Six Types of Indication
Dalālah is the broader idea: knowledge of one thing leads to another. Waḍʿ is one particular basis for it: a sign has been assigned to a meaning.
Example 1: Hearing “book” and grasping its meaning relies on linguistic convention.
Example 2: Seeing smoke and inferring fire relies on a rational connection; no one named fire by assigning it the sign of smoke.
Every conventional indication is an indication, but not every indication is conventional.