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

(mathematics) geometrical

"Historical kana usage", a prescriptive method of using kana to write Japanese. Devised in the Edo period by Keichū (契沖) and taught in schools until 1946, it aims to be etymologically faithful and reflects earlier stages of the language (Heian period and earlier).

humanitarian

hostile takeover