Oi
Oi (also as OI) may refer to: == In biology == Grey-faced petrel, also known by its Māori name oi Orthostatic intolerance, a disorder of the autonomic nervous system Osteogenesis imperfecta, a group of genetic bone disorders == In business == Oi (telecommunications), the largest landline telephone company in Brazil Organizational intelligence, in business manage == In linguistics == Oi (digraph), a Latin-script digraph Oi (interjection), an interjection used to get someone's attention, or to express surprise or disapproval Oi language, a Mon–Khmer dialect cluster of southern Laos Gha, a letter (Ƣ ƣ) erroneously referred to by Unicode as "oi" == In music == Oi! , a subgenre of punk rock "Oi!