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I recognize the heart radical at the bottom of the kanji 悪, but I cannot make
my mind about the upper one.

  * Do you know the name of this radical?
  * Do you also know of another Kanji using this radical? 

I have some notions of Chinese, and I don't seem to recognize a similar
radical. I have been told Kanji/Hanzi have been simplified differently during
history depending on Chinese or Japan. So maybe there's a different simplified
Chinese form for this one.
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question
kanji radicals
What is the upper radical in the Kanji 悪?
The upper part of 悪, 亜{あ} itself is not a radical, but if you take the kanji
亜, it's radical is 二.
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> _Do you know the name of this radical ?_

It is **亜【あ】** , which is not only a component (calling it _radical_ is
technically wrong) but an independent character that even has [a dedicated
page on Wiktionary](https://en.wiktionary.org/wiki/%E4%BA%9C).

> _Do you also know of another Kanji using this radical?_

Yes, and there is [a relatively user-friendly website to look up
kanji](https://jigen.net/) if you read Japanese.

When you [search for 悪](https://jigen.net/kanji/24746), you will get its
decomposition ⿱亜心. And if you put 亜 in the search form as "component" (部品),
you will get [a handful of
characters](https://jigen.net/data/%E8%A9%B3%E7%B4%B0%E6%A4%9C%E7%B4%A2%EF%BC%9A%E4%BA%9C%E3%82%92%E5%90%AB%E3%82%80%E6%BC%A2%E5%AD%97?type2=1&rs=100).
But if you see [the information page of 亜](https://jigen.net/kanji/20124), you
will be notified that its traditional form is 亞, which is likely to be used in
more (i.e. [non-常用](https://en.wikipedia.org/wiki/Shinjitai)) kanji. So if you
look up 亞 as component, you will get [a bunch of
characters](https://jigen.net/data/%E8%A9%B3%E7%B4%B0%E6%A4%9C%E7%B4%A2%EF%BC%9A%E4%BA%9E%E3%82%92%E5%90%AB%E3%82%80%E6%BC%A2%E5%AD%97?type2=1&rs=200).
Here is the dump:

> 唖 亜  
>  鵶 閸 鐚 錏 蝁 稏 癋 瘂 琧 氬 椏 斵 掗 惡 孲 婭 壼 堊 埡 噁 啞 僫 俹 䢝 䜑 䛩 䃁 㰳 㝞
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Most people use a method that is based on dividing the Kanji into left and
right sections, where in most cases the left half of the Kanji represents the
radical (辺).

However, this method doesn’t usually work when the radical is located at the
top, is surrounding, or only occupies a corner of the Kanji.

In conclusion, it requires (1) a lot of practice, (2) an intimate knowledge of
the Kaji, such as (3) knowing its origin, (4) the order of its strokes, and
(5) the Kanji’s interpretation in order to accomplish what you’re trying to
do, and identify its radicals.

Hope the above helps :)
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