from Wiktionary, Creative Commons Attribution/Share-Alike License.
Chinese, Japanese, Koreanand Vietnamese, East Asianlanguages heavily influenced by the Chinese writing system and vocabulary.
Sorry, no etymologies found.
Script/language sensitivity: Used mostly in CJKV fonts, but can apply to European scripts.
It replaces and extends the earlier locale-specific tags zhcn, zhtw, jajp, kokr and vivn which had been defined for CJKV scripts.
Google: CJKV book and the half-width vs full width katakana question is clearer - these are separate codepoints in a coded character set, including in Unicode for compatibility
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