Kokuji

Chinese characters
Chinese family of scripts Written Chinese Kanji Hanja Chữ Hán
Evolution of script styles Neolithic symbols in China Oracle bone Bronze Seal Large Small Bird-worm Clerical Cursive Semi-cursive Regular Flat brush Typefaces Fangsong Ming sans-serif
Properties and classification Components Strokes order Radicals
Collation and standards Kangxi Dictionary forms (1716) General Standard Characters (PRC, 2013) Commonly-Used Characters (Hong Kong, 2007) Nan Min Recommended Characters (Taiwan, 2009) Standard Form of National Characters (Taiwan, 1982) Jōyō kanji (Japan, 2010)
Reforms Simplified characters second round Traditional characters debate Japanese script reform kyūjitai
Homographs and readings Literary and colloquial readings Kanbun Idu
Variants Zetian characters
Derived systems Kana man'yōgana hiragana katakana Jurchen script Khitan large small Nüshu Bopomofo Slavonic transcription
Transliteration of Chinese
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Japanese writing
Components
Kanji Stroke order Radicals Kyōiku kanji Jōyō kanji (Tōyō kanji) Jinmeiyō kanji Hyōgai kanji List of kanji by stroke count
Kana Hiragana Katakana Hentaigana Man'yōgana Sōgana Gojūon
Typographic symbols Japanese punctuation Iteration mark
Uses
Syllabograms Furigana Okurigana Braille
Transliteration
Rōmaji Hepburn (colloquial) Kunrei (ISO) Nihon (ISO transliteration) JSL (transliteration) Wāpuro (keyboard)
Cyrillization Polivanov system
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In Japanese, Kokuji (国字, "national characters") or Wasei kanji (和製漢字, "Japanese-made kanji") are kanji created in Japan rather than borrowed from China. Like most Chinese characters, they are primarily formed by combining existing characters - though using combinations that are not used in Chinese.

Since kokuji are generally devised for existing native words, they usually only have native kun readings. However, they occasionally also have a Chinese on reading derived from a related kanji, such as 働 (dō, 'work'), which takes its on pronunciation from 動 (dō, 'move'). In rare cases a kokuji may only have an on reading, such as 腺 (sen, 'gland'), which was derived from 泉 (sen, 'spring, fountain') for use in medical terminology.

The majority of kokuji are semantic compounds, meaning that they are composed of two (or more) characters with relevant meanings. For example, 働 ('work') is composed of 亻 ('person' radical) plus 動 ('move'). This is in contrast to Chinese kanji, which are overwhelmingly phono-semantic compounds. This is because the phonetic element of phono-semantic kanji is always based on the on reading, which most kokuji don't have, leaving semantic compounding as the only alternative. Other examples include 榊 'sakaki tree', formed from 木 'tree' and 神 'deity' (literally 'divine tree'), and 辻 'crossroads' formed from 辶 'road' and 十 'cross'.

Kokuji are especially common for describing species of flora and fauna including a very large number of fish such as 鰯 (sardine), 鱈 (codfish), 鮴 (seaperch), and 鱚 (sillago), and trees such as 樫 (evergreen oak), 椙 (Japanese cedar), 椛 (birch, maple) and 柾 (spindle tree).^[1]