Oi (also as OI) may refer to:

In biology

Grey-faced petrel The grey-faced petrel (''Pterodroma gouldi'') is a species of petrel endemic to the North Island of New Zealand. In New Zealand it is also known by its Māori name and (along with other species such as the sooty shearwater) as a muttonbird. ...

, also known by its Māori name ''oi'' *

Orthostatic intolerance Orthostatic intolerance (OI) is the development of symptoms when standing upright that are relieved when reclining. There are many types of orthostatic intolerance. OI can be a subcategory of dysautonomia, a disorder of the autonomic nervous ...

, a disorder of the autonomic nervous system *

Osteogenesis imperfecta Osteogenesis imperfecta (; OI), colloquially known as brittle bone disease, is a group of genetic disorders that all result in bones that bone fracture, break easily. The range of symptoms—on the skeleton as well as on the body's other Or ...

, a group of genetic bone disorders

In business

Oi (telecommunications) Oi (, Portuguese for "Hi"), formerly known as Telemar, is the largest fixed telephone operator and the fourth mobile telephone operator in Brazil, being the third largest telecommunication company in Latin America. It is headquartered in Rio de J ...

, the largest landline telephone company in Brazil *

Operational intelligence An operational definition specifies concrete, replicable procedures designed to represent a construct. In the words of American psychologist S.S. Stevens (1935), "An operation is the performance which we execute in order to make known a concept." F ...

, in business analytics * Organizational intelligence, in business manage

In linguistics

* Oi (digraph), a Latin-script digraph *

Oi (interjection) ''Oi'' is an interjection used in various varieties of the English language, particularly Australian English, British English, Indian English, Irish English, New Zealand English, and South African English, as well as non-English languages such ...

, an interjection used to get someone's attention, or to express surprise or disapproval *

Oi language Oi (''Oy, Oey''; also known as The, Thang Ong, Sok) is an Austroasiatic dialect cluster of Attapeu Province, southern Laos Laos, officially the Lao People's Democratic Republic (LPDR), is the only landlocked country in Southeast Asia. It ...

, a Mon–Khmer dialect cluster of southern Laos * Gha, a letter (Ƣ ƣ) erroneously referred to by Unicode as "oi"

In music

Oi! Oi! is a subgenre of punk rock that originated in the United Kingdom in the late 1970s. The music and its associated subculture had the goal of bringing together punks, skinheads, and other disaffected working-class youth. The movement wa ...

, a subgenre of punk rock * "Oi!" (song), a 2002 hit song for British grime music crew More Fire Crew

Organisations

Oi! (Hong Kong) Oi! is a Hong Kong government art promotion organisation. It was developed by the Leisure and Cultural Services Department, and aims to promote visual arts by providing a platform for art exhibitions, forums and other art-related activities. ...

, a visual arts organisation in Hong Kong *

Oi (Indonesia) 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 * ...

, an

Iwan Fals Virgiawan Listanto or better known as Iwan Fals (born 3 September 1961) is an Indonesian singer, songwriter and guitarist of Javanese descent. In 2002, ''Time'' named him a Great Asian Hero. Early life Iwan Fals was born Virgiawan Listanto in ...

fanbase foundation in Indonesia *

Oriental Institute (disambiguation) Oriental Institute may refer to a number of university faculties, departments, and institutes of Oriental studies: United States * Institute for the Study of Ancient Cultures, formerly the Oriental Institute, University of Chicago United Kingdom ...

Orphans International Orphans International Worldwide (OIWW) is a charitable organization created to house and educate orphans and abandoned children. In response to the crisis facing orphaned children around the world, former investment bank employee Jim Luce founde ...

, a global charitable organization that benefits orphans and abandoned children

Other uses

Oi (general) Oi () was a general who helped to found the Goguryeo, one of the Three Kingdoms of Korea. Biography Oi, Hyeopbo, Mari, and Jumong were associated as friends. Jumong made them his bodyguards during the time he was at the palace and Oi's career ...

, Goguryeo general *

Japanese cruiser Ōi was the fourth of five light cruiser, which served in the Imperial Japanese Navy during World War II. She was named after the Ōi River in Shizuoka prefecture, Japan. Designed as a command vessel for a destroyer squadron, she was converted in ...

* O-I, a Japanese tank design of the Second World War *

Organoid intelligence Organoid intelligence (OI) is an emerging field of study in computer science and biology that develops and studies wetware computer, biological wetware computing using 3D cultures of human brain cells (or brain organoids) and brain-machine inter ...