Ai (as a word, proper name and acronym) can refer to many things.

Technology

does not include companies or organizations

• Adobe Illustrator (.ai)(AI), as the file extension for the native file format and abbreviation of this application
• Artificial intelligence (AI), intelligence exhibited by any manufactured system, likely the most common usage

Television and Film

does not include companies or organizations

• A.I. (film), a 2001 film directed by Steven Spielberg
• American Idol (AI), the American television series
• Australian Idol (AI), the Australian television series

Medicine

• Aortic insufficiency (AI), a symptom of a heart disorder
• Aromatase inhibitor (AI), one of a class of drugs used to treat cancer, in particular breast cancer
• Artificial insemination (AI), the insertion of male sperm into the female reproductive tract using artificial means other than sexual intercourse

Geography

• Ai (Bible), a place mentioned in the Bible, likely identical to the archaeological site of Et-Tell
• Anguilla (AI), as the ISO 2-letter country code
• Appenzell Innerrhoden (AI), a Swiss canton

People and types of people

• Ai (poet) (born 1947), American poet
• AI (singer) (born 1981), a Japanese hip-hop singer
• Ai Otsuka (born 1982), popular Japanese singer
• Allen Iverson (born 1975) (AI), an NBA basketball player

Fictional people

• "Ai Amano", the main character in the manga series Video Girl Ai

Organizations

• Air India (AI) (IATA airline designator)
• Amnesty International (AI), an international non-governmental organization
• The Art Institutes (AI), a system of educational institutions

Other

• Ai (animal), a three-toed sloth
• Ai (chimpanzee), a female chimp famous for showing surprising numerical capability.
• Air interdiction (AI), a military capability
• Annals of Inisfallen (AI), a chronicle of the medieval history of Ireland
• Aoi Mac Ollamain (Ai), the Celtic god of poetry as an alternative first name and name abbreviation
• Artificial Intelligence (series) (AI), a musical album series by Warp Records
• Love (Ai) in the sense of "universal love" as developed by the Chinese philosopher Mozi

See also

• Ay, a pharoah of Ancient Egypt (which can also appear as Ai)
• Ái, the husband of Edda and putative ancestor of the thralls or serfs in the Norse eddic poem Rígthula
• .ai (the ccTLD for Anguilla).