Bayān concerns different ways of making a single intended meaning accessible. It therefore requires a sound account of the relationship among the word, its assigned meaning, and the meaning ultimately intended.
Bayān: The study of alternative expressions and their comparative clarity in conveying one meaning.
Dāll / madlūl: An indicator and what is understood through it.
Verbal / nonverbal: Whether the indicator is a word.
Muṭābaqah / taḍammun / iltizām: Indication of the full sense, its internal component, or its external necessary concomitant.
With these distinctions established, the finer questions about implication, mental inference, and degrees of clarity become intelligible, supporting the technical analysis of simile, figurative expression, and allusion.