What are the three uses of language, according to "What Is Poetry?"

Three uses of of language is:

1: phonaesthetics,

2: Sound symbolism

3: Metre

Poetry (the term derives from a variant of the Greek term, poiesis, "making") is a form of literature that uses aesthetic and rhythmic qualities of language - such as phonaesthetics, sound symbolism, and metre-to evoke meanings in addition to, or in place of, the prosaic ostensible meaning.