ISO/CEI 10646
When writing Hokkien in Chinese characters, some writers create 'new' characters when they consider it impossible to use directly or borrow existing ones; this corresponds to similar practices in character usage in Cantonese, Vietnamese chữ nôm, Korean hanja and Japanese kanji. Some of these are not encoded in Unicode (or the corresponding ISO/IEC 10646: Universal Character Set), thus creating problems in computer processing.