Sign Language: P
"Phonocentrism is the hearing people's disease, not deafness." -- Jolanta Lapiak, 2013.
How do First Nations or American Natives tribes communicate with one another? See Plains Indian Sign Language.
What are the smallest units of language in sign language? See Phonology.
Phonocentrism: the superiority of speech language (e.g. presence) over written language (e.g. absence). also the metaphysical superiority of speech language over sign language.
Phonology: the study of phonemes, the smallest units of language.
Poetics: the systematic study of literature, or a unified theory of texts.