Oi or OI may refer to:

In biology

Grey-faced petrel The grey-faced petrel (''Pterodroma gouldi'') is a petrel endemic to the North Island of New Zealand. In New Zealand it is also known by its Māori language, 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 sy ...

, 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 break easily. The range of symptoms—on the skeleton as well as on the body's other organs—may be mi ...

, 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 Jan ...

, the largest landline telephone company in Brazil *

Operational intelligence Operational intelligence (OI) is a category of real-time dynamic, business analytics that delivers visibility and insight into data, streaming events and business operations. OI solutions run queries against streaming data feeds and event data t ...

, 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, Irish English, New Zealand English, and South African English, as well as non-English languages such as Chinese, Hi ...

, 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. The dominant variety is Oy proper, with 11,000 speakers who are 80% monolinguals. The Jeng (Cheng) speak the same langua ...

, a Mon–Khmer dialect cluster of southern Laos *

Gha GHA may refer to: Entertainment * ''Ghost Hunters Academy'', an American television series Government * Ghana Highways Authority * Gibraltar Health Authority * Wheatley Homes Glasgow (formerly "Glasgow Housing Association") Language * 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 was ...

, 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 or 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 (t ...

, an

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

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 * Oriental Institute (Chicago), part of the University of Chicago ;United Kingdom * Faculty of Oriental Studies, par ...

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

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 i ...

O-I O-I was the name given to a proposed series of Japanese super-heavy tanks, to be used in the Pacific Theater. The vehicle was planned to be very heavy and have a crew of 11. The complete history of the O-I is unknown, due to the “obscure” na ...