Boi or BOI may refer to:
Boise (/bɔɪsi/) is the capital and most populous city of the U.S. state of Idaho, as well as the county seat of Ada County.
The boiling water reactor (BWR) is a type of light water nuclear reactor used for the generation of electrical power.
Boise State University (BSU) is a college in Boise, Idaho. Founded in 1932 by the Episcopal Church, it became an independent junior college in 1934, and has been awarding baccalaureate and master's degrees since 1965.
The Boise City–Nampa, Idaho Metropolitan Statistical Area (MSA) (commonly known as the Boise Metropolitan Area or the Treasure Valley) is an area that encompasses Ada, Boise, Canyon, Gem, and Owyhee counties in southwestern Idaho.
Boiled eggs are eggs (typically chicken eggs) cooked with their shells unbroken, usually by immersion in boiling water.
A boiler or steam generator is a device used to create steam by applying heat energy to water. Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure (1–300 psi or 6.895–2,068.427 kPa) but, at pressures above this, it is more usual to speak of a steam generator.
A boiler is a closed vessel in which water or other fluid is heated. The fluid does not necessarily boil.
A boilerplate spacecraft, also known as a mass simulator, is a nonfunctional craft or payload which is used to test various configurations and basic size, load, and handling characteristics of rocket launch vehicles.
Boiling water reactor safety systems are nuclear safety systems constructed within boiling water reactors in order to prevent or mitigate environmental and health hazards in the event of accident or natural disaster.