the Baijiaxing (Hundred Family Surnames), a classic Chinese text composed of surnames

the most noble three branches of the Tokugawa clan (徳(とく)川(がわ)氏(し) (Tokugawa-shi)): 尾張(おわり) (Owari), 紀伊(きい) (Kī), and 水戸(みと) (Mito) / (figuratively) the "big three"

a female given name

author of hentai (pornographic manga)

New Tokyo International Airport (TYO), currently named Narita International Airport)

International Date Line (line on the Earth's surface)

the United Nations Children's Fund

the International Criminal Police Organization

an International Standard Book Number

(history, socialism, communism, anarchism) Synonym of 第一インターナショナル (Daiichi Intānashonaru, “First International”); the International Workingmen's Association