<p><strong>√A ("root A")</strong> is a reference to and pun on the <a href="http://tokyoghoul.wikia.com/wiki/Aogiri_Tree">Aogiri Tree</a> organization, which is the focus of the second season. "A" is simply the first letter of the organization, and the <a href="https://en.wikipedia.org/wiki/Square_root">root</a> is a pun on <a href="https://en.wikipedia.org/wiki/Root">tree root</a> (since it's the Aogiri <em>Tree</em>).</p>

CC BY-SA 3.0
2015-03-27T17:51:50.597Z
There is another theory that it's "Route A", since the anime has some deviation at the beginning of the season.
nhahtdh
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2015-03-27T17:53:06.963Z
@nhahtdh Interesting. I could see that being a plausible explanation, too.
Cattua
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2015-03-27T22:16:11.143Z
nhahtdh's theory is the one that I have heard.
Brad Whoville
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2015-03-27T17:42:49.700Z
2015-03-27T17:42:49.700Z
Cattua
<p>As the title says, why is Tokyo Ghoul's second season called √A?</p>

<tokyo-ghoul>
Why is Tokyo Ghoul's second season called √A?
# Why is Tokyo Ghoul's second season called √A?
Posted by: username_0 on 2015-03-27
As the title says, why is Tokyo Ghoul's second season called √A?
**Tags:** tokyo-ghoul
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## 1 answers
### Answer by username_1 on 2015-03-27. Score: 16 | Accepted answer
**√A ("root A")** is a reference to and pun on the [Aogiri Tree](http://tokyoghoul.wikia.com/wiki/Aogiri_Tree) organization, which is the focus of the second season. "A" is simply the first letter of the organization, and the [root](https://en.wikipedia.org/wiki/Square_root) is a pun on [tree root](https://en.wikipedia.org/wiki/Root) (since it's the Aogiri *Tree*).
> **Comments:**
> **username_2** (2015-03-27): There is another theory that it's "Route A", since the anime has some deviation at the beginning of the season.  
> **username_1** (2015-03-27): @nhahtdh Interesting. I could see that being a plausible explanation, too.  
> **username_3** (2015-03-27): nhahtdh's theory is the one that I have heard.  
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