BI

Bi or bi may refer to:
* Bi, a type of jade disc produced in ancient China.
* Bi/Rain, stage name for the popular Korean singer Jung Ji-Hoon.
* Billon, in numismatics, an alloy of less than 50% silver.
* Bisexuality, a sexual orientation with attraction to both one's own and the opposite gender.

BI, bi or Bi is also a common two-letter code or symbol:
* "bi", the ISO 639 alpha-2 language code for the Bislama language.
* "Bi", the chemical symbol for bismuth.
* "Bi", the Biot number, a dimensionless number in physics in unsteady-state heat transfer calculations.
* .bi, the Internet top-level domain for Burundi.
* "bi", the WMO and ISO 3166-1 country code for Burundi.
* "BI", the IATA airline code for Royal Brunei Airlines.

BI may also be an acronym for:
* Business informatics, the combined discipline of information technology and management.
* Bank Indonesia, the national bank of Indonesia.
* Bayesian inference, in statistics, is where new information is taken in account in order to recompute a probability.
* "Bedriftsøkonomisk Institutt", the Norwegian School of Management.
* "Bilhete de Identidade", the common abbreviation for the names of the national ID cards of Portugal and Mozambique.
* Boehringer Ingelheim, a German pharmaceutical company.
* Braniff International Airways, a now-defunct large air passenger service.
* British Invisibles, a British trade organisation.
* Business intelligence, in information technology, the discipline of dealing and analysing business-related information.
* , an expansion pack in the computer game.
* Burning Index, A number relating to the potential amount of effort needed to contain a single fire in a particular fuel type within a rating area derived from the NFDRS.
* Breidbart Index, measure of severity of Usenet newsgroup spam
* bodily injury liability, insurence