The book first divides indication into lafẓī (verbal) and ghayr lafẓī (nonverbal). The criterion is what the indicator is, not what kind of thing it indicates.
Verbal: the indicator is an uttered word, such as saying “Zayd” to refer to Zayd.
Nonverbal: the indicator is not a word, as with visible smoke indicating fire.
Even if the inferred meaning can be expressed in words, that does not turn a nonverbal indicator into a verbal one.
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First split: verbal and nonverbal
Dalālah, Waḍʿ and the Six Types of Indication
The book first divides indication into lafẓī (verbal) and ghayr lafẓī (nonverbal). The criterion is what the indicator is, not what kind of thing it indicates.
Verbal: the indicator is an uttered word, such as saying “Zayd” to refer to Zayd.
Nonverbal: the indicator is not a word, as with visible smoke indicating fire.
Even if the inferred meaning can be expressed in words, that does not turn a nonverbal indicator into a verbal one.