Pronoun of matter is a pronoun that starts a sentence, explaining its meaning. It is called pronoun of matter because it symbolizes the matter, that is, the situation that it is intended to describe.Kufi scholars call it the unknown pronoun because it is not preceded by the reference that indicates it. This pronoun violates the rules and general principles as follows: 1. It must be a subject. 2. Its form must be singular. 3. It must have a sentence that explains it. The content of the interpretive sentence must be something great to be taken care of. 4. The interpretive sentence must follow it. 5. It must not indicate coordination, affirmation, or replacement. 6. If, by reason of its occurrence, the object of a repealing act is established, it sets up two objects whose origin is subject and predicate, which must be related to its agent. 7. Pronoun of matter specified in some Ayahs may not be a pronoun of matter in other Ayahs. Pronoun of matter is either separable or inseparable

.