CJK characters

In internationalization, CJK characters is a collective term for the Chinese, Japanese, and Korean languages, all of which include Chinese characters and derivatives in their writing systems, sometimes paired with other scripts. Collectively, the CJK characters often include Hànzì in Chinese, Kanji and Kana in Japanese, and Hanja and Hangul in Korean. Vietnamese can be included, making the abbreviation CJKV, as Vietnamese historically used Chinese characters in which they were known as chữ Hán and chữ Nôm in Vietnamese (Hán-Nôm altogether).