Sinosphere; Chinese-character cultural sphere
Refers to the group of countries and regions in East and Southeast Asia where Chinese characters have been historically used in writing, including China, Japan, Korea, and Vietnam.
In countries belonging to the Sinosphere, Chinese characters have been used as a common script.
Compound of 漢字 (kanji, 'Chinese characters'), 文化 (bunka, 'culture'), and 圏 (ken, 'sphere'). The term is a modern coinage used in academic and cultural discourse.