ISO-IR-165 incorporates the GB 2312 extensions from both GB 6345.1-86 and GB 8565.2-88. Additionally, it adds 161 further characters (including 139 hanzi, identified as “general Chinese characters and variants”). These CCITT hanzi extensions have on occasion been mistaken for standard GB 8565.2 characters, including in previous revisions of the Unihan database. In total the set contains 8446 characters.
