The question is very simple: how many kanji there are that have a 'unique' ON-
reading, not shared by any other kanji? Or, as it is probably a too general
question given the variety of kanji: how many one-kanji ON-readings exist in
the Joyo list? Do any of those readings gain additional kanji if we start to
consider Jinmeiyo-kanji / non-Joyo-kanji / non-standard readings? Tricky
readings like [頁]{ページ} or [糎]{センチメートル} are excluded.

Example, which I know: the チャ reading is only with 茶 while we are in Joyo, but
if we extend our search, there are at least 茗 and 楪 which share the same.
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2018-05-24T16:40:25.537
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2018-05-25T02:42:35.900
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question
kanji readings
Kanji with unique on'yomi
According to a list in [this
answer](https://japanese.stackexchange.com/a/24994/5010), there are **65**
joyo-kanji which have a unique on-reading (in the sense of "has a reading not
shared by other kanji"). They include 茶. Since even easy joyo-kanji have some
nonstandard/rare readings which are not covered by all dictionaries, the
number should vary depending on the method. For example, the list says 条 has a
unique on-reading デキ, but I don't know when 条 can be read like that. Also note
that the list seems a bit old. The list says ボッ is unique to 坊, but it's no
longer true since 勃, a kanji [recently
included](https://www.coscom.co.jp/japanesekanji/newjoyo_bunrui.html) in the
joyo list, can be read as ボッ, too. 鬱 (ウツ) is now a joyo kanji, and probably
has a unique on-reading.
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2018-05-24T22:12:45.670
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2018-05-24T22:41:26.163
2018-05-24T22:41:26.163
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answer