- (Japanese language) kanji characters invented in Japan
- Some kokuji have since been used in Chinese languages; see Category:Japanese-coined CJKV characters used outside Japanese.
- Some kokkun (characters borrowed from Chinese, but given different meanings in Japanese) are often mislabeled as kokuji.
- Japanese simplifications are instead referred to as 新字体 (しんじたい, shinjitai, “new character forms”).
Japanese 国字 (こくじ kokuji), from Middle Chinese 國 (kwok "kingdom", "nation") + 字 (dzì "[written] character").