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It doesn't apply to all the words, just some. Here are examples of words from
that are marked with that symbol

  * 悪い (with reading にくい): [大辞泉](http://dictionary.goo.ne.jp/leaf/jn2/166457/m0u/%E6%86%8E%E3%81%84/); [大辞林](http://www.weblio.jp/content/%E6%86%8E%E3%81%84)
  * 面倒くさい (with reading めんどくさい): [大辞泉](http://dictionary.goo.ne.jp/leaf/jn2/264709/m0u/%E3%82%81%E3%82%93%E3%81%A9%E3%81%8F%E3%81%95%E3%81%84/); [大辞林](http://www.weblio.jp/content/%E3%82%81%E3%82%93%E3%81%A9%E3%81%8F%E3%81%95%E3%81%84)
  * 皆 (with reading みんな): [大辞泉](http://dictionary.goo.ne.jp/leaf/jn2/214380/m0u/%E3%81%BF%E3%82%93%E3%81%AA/); [大辞林](http://www.weblio.jp/content/%E3%81%BF%E3%82%93%E3%81%AA)
  * 判る・解る (with reading わかる): [大辞泉](http://dictionary.goo.ne.jp/leaf/jn2/237767/m0u/%E3%82%8F%E3%81%8B%E3%82%8B/); [大辞林](http://www.weblio.jp/content/%E3%82%8F%E3%81%8B%E3%82%8B)

The thing is even for the same word, 大辞林 and 大辞泉 places the ▽ symbol at
different positions.

For your convenience, here are 2 cropped screenshots to illustrate what I
mean:

  1. From 大辞林

![大辞林](https://i.stack.imgur.com/cGomf.jpg)

  2. From 大辞泉

![大辞泉](https://i.stack.imgur.com/wlVTk.jpg)

Apparently 明鏡国語辞典 uses this symbol too. Here's a screenshot for 解る・判る from an
EPWING viewer.

![enter image description here](https://i.stack.imgur.com/nQOKx.jpg)

As far as I know, 広辞苑 doesn't use this symbol. See below

![enter image description here](https://i.stack.imgur.com/2eAs1.jpg)

* * *

As I'm typing this, I noticed a pattern: the symbol seems to indicate that the
reading is either non-standard or not-so-common for that particular kanji.
Several kanji references seem to support this interpretation.

Take 悪 for example, [kakijun](http://kakijun.jp/page/aku200.html) mentions
"にく(む)[常用外]", and [漢字辞典ネット](http://www.kanjijiten.net/jiten/1601.html#k1613)
labels "にく(む)" with 準1 (which I assume is the second highest level in 漢検?).
Same for 判る and 解る, whereas みんな and ど aren't listed as reading for 皆 and 倒
(perhaps those are more colloquial?).

It's just that 大辞泉 and 大辞林 uses different convention: for 大辞泉 it's the kanji
to the right of ▽, for 大辞林 it's the kanji to the left of ▽.

Am I going in the right direction with this interpretation?
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2014-07-21T12:49:33.973
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question
readings dictionary symbols
Some Japanese dictionaries (e.g. 大辞林, 大辞泉, and 明鏡国語辞典) use this inverted triangle outline symbol (▽) for some kanji compounds. What does it mean?
> Am I going in the right direction with this interpretation?

You got it, friend! [大辞林曰く](http://www.weblio.jp/sanseido.jsp)、

> 【 】の中【なか】の漢字【かんじ】が「常用【じょうよう】漢字【かんじ】表【ひょう】」にないものには「 ▼
> 」、その漢字が「常用漢字表」にはあるが見出【みだ】しに相当【そうとう】する音訓【おんくん】が示【しめ】されていないものには「 ▽
> 」を漢字の右肩【みぎかた】に付【ふ】した。  
>  If a given kanji isn't part of the 常用漢字 list, it'll be marked with a ▼. If
> it _is_ part of the 常用漢字 list but uses a non-standard reading, a ▽ will be
> placed on its right side.

Same deal on the [大辞泉](http://dictionary.goo.ne.jp/help/jn/09_04.html):

> ▽ 常用漢字表にない音訓  
>  ▽ Non-standard reading of a 常用漢字

So yes, **the ▽ symbol indicates a non-standard kanji reading**. And yeah, it
looks like both dictionaries choose opposite sides of the characters to place
the symbol on.
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2014-07-23T01:22:17.727
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answer