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Hyōgaiji (表外字) (also hyōgai kanji (表外漢字) and jōyōgai kanji (常用外漢字?)) are Japanese kanji outside the two major lists Jōyō, which are taught in primary and secondary school, and Jinmeiyō, which are additional kanji that officially are allowed for use in personal names. (Wikipedia)
Read more detail at this address Hyōgaiji - Wikipedia, the free encyclopedia