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Han unification is the process used by the authors of Unicode and the Universal Character Set to map multiple character sets of the CJK languages into a single set of unified characters. The Chinese characters are common to Chinese (where they are called hanzi), Japanese (where they are called kanji), Korean (where they are called hanja) and Vietnamese (Hán Tự). Modern Korean, Chinese and Japanese typefaces may represent a given Han character as somewhat different glyphs. However, in the formulation of Unicode, these different glyphs were treated as the same character. This unification is referred to as "Han unification", with the resulting character repertoire sometimes referred to as Unihan.