Japanese script reform in the context of "ん"

The kana orthography (正仮名遣い, sei kana-zukai) in general use for writing the Japanese language until orthographic reforms after World War II is referred to as historical kana orthography (歴史的仮名遣い, rekishiteki kanazukai) or old orthography (旧仮名遣い, kyū kanazukai). The current orthography was adopted by Cabinet order in 1946. By that point the historical orthography was no longer in accord with Japanese pronunciation. It differs from modern usage (現代仮名遣い, gendai kanazukai) in the number of characters and the way those characters are used. There was considerable opposition to the official adoption of the current orthography, on the grounds that the historical orthography conveys meanings better, and some writers continued to use it for many years after.

The historical orthography is found in almost all Japanese dictionaries, such as Kōjien. In the current edition of the Kōjien, if the historical orthography is different from the modern spelling, the old spelling is printed in tiny katakana between the modern kana and kanji transcriptions of the word. Ellipses are used to save space when the historical and modern spellings are identical. Older editions of the Kōjien gave priority to the historical orthography.

Furigana (振り仮名; Japanese pronunciation: [ɸɯɾigaꜜna] or [ɸɯɾigana]) is a Japanese reading aid consisting of smaller kana (syllabic characters) printed either above or next to kanji (logographic characters) or other characters to indicate their pronunciation. It is one type of ruby text. Furigana is also known as yomigana (読み仮名) and rubi (ルビ; [ɾɯꜜbi]) in Japanese. In modern Japanese, it is usually used to gloss rare kanji, to clarify rare, nonstandard or ambiguous kanji readings, or in children's or learners' materials. Before the post-World War II script reforms, it was more widespread.

Furigana is most often written in hiragana, though in certain cases it may be written in katakana, Roman alphabet letters or in other, simpler kanji. In vertical text, tategaki, the furigana is placed to the right of the line of text; in horizontal text, yokogaki, it is placed above the line of text, as illustrated below.