Combining two kinds of signs with three kinds of connection yields six forms of signification.
1. Verbal conventional: “Zayd” indicates the person so named.
2. Verbal natural: an involuntary “akh, akh” expresses pain.
3. Verbal rational: a word heard behind a wall indicates a speaker.
4. Nonverbal conventional: an agreed flag or signal indicates a message.
5. Nonverbal natural: a horse's neigh indicates a natural need.
6. Nonverbal rational: smoke indicates fire.
This follows the main text's sixfold scheme. The commentary calls the enumeration inductive and reports a disagreement attributed to Sayyid al-Sanad about counting nonverbal natural signification separately.