Jisho

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Noun
1. non-jōyō kanji; kanji not included in the common-use kanji listSee also 表外漢字, See also 常用漢字
Wikipedia definition
2. Hyōgaiji, literally characters from outside the table (also hyōgai kanji and jōyōgai kanji) 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. Because hyōgaiji is a catch-all category for "all unlisted kanji", there is no comprehensive list, nor is there a definitive count of the hyōgaiji.
Read “Hyōgaiji” on English Wikipedia
Read “表外字” on Japanese Wikipedia
Read “Hyōgaiji” on DBpedia

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