CJK Unified Ideographs (Unicode block)
CJK Unified Ideographs is a Unicode block containing the most common CJK ideographs used in modern Chinese, Japanese, Korean and Vietnamese characters. When contrasted with other blocks containing CJK Unified Ideographs, it is also referred to as the Unified Repertoire and Ordering (URO).
Source: Wikipedia — CJK Unified Ideographs (Unicode block) (CC BY-SA 4.0)