Why does the IME give me "←" when I type "zh"?


I accidentally typed "zh" using the Japanese IME on macOS Sierra.
Surprisingly, "zh" turned into a "←" character! Why does it do this? I would
have expected it to produce just "zh", like it does with other two consecutive
consonants: "kr" is "kr", "mn" is "mn". Why is "zh" a left arrow?

I did some guessing and thought that the "h" must stand for 左, that's why it's
a left arrow and not a right one. Then I tried "zm", thinking that it would
give me a right arrow because "m" stands for 右, it _didn't_.

I am so confused. What does "zh" stand for? Why a left arrow? How do I do a
right one?

Note: the left arrow is U+2190 "LEFTWARDS ARROW"




I can't tell you about the wherefore but that seems to be a shortcut
associated with the letter z + hjkl-directional keys. Moreover this doesn't
work with all IME (but it can be reproduced with Google IME, you can try that
on Google Translate website)

                                           [![enter image description here](https://i.stack.imgur.com/P9tGo.jpg)](https://i.stack.imgur.com/P9tGo.jpg)

I dug a bit more and here a list of keys that goes with the `z`-mod key.

  * ZH   ← （左矢印）
  * ZJ   ↓ （下矢印）
  * ZK   ↑ （上矢印）
  * ZL   → （右矢印）
  * Z,（コンマ）   ‥ （二点リーダ）
  * Z.（ピリオド）   … （三点リーダ）
  * Z/   ・ （中点）
  * Z[   『 （始め二重かぎ括弧）
  * Z]   』 （終わり二重かぎ括弧）
  * Z-   ～ （波ダッシュ）

[Source](http://daredemopc.blog51.fc2.com/blog-entry-561.html)




I can't tell you about the wherefore but that seems to be a shortcut
associated with the letter z + hjkl-directional keys. Moreover this doesn't
work with all IME (but it can be reproduced with Google IME, you can try that
on Google Translate website)

                                           [![enter image description here](https://i.stack.imgur.com/P9tGo.jpg)](https://i.stack.imgur.com/P9tGo.jpg)

I dug a bit more and here a list of keys that goes with the `z`-mod key.

  * ZH   ← （左矢印）
  * ZJ   ↓ （下矢印）
  * ZK   ↑ （上矢印）
  * ZL   → （右矢印）
  * Z,（コンマ）   ‥ （二点リーダ）
  * Z.（ピリオド）   … （三点リーダ）
  * Z/   ・ （中点）
  * Z[   『 （始め二重かぎ括弧）
  * Z]   』 （終わり二重かぎ括弧）
  * Z-   ～ （波ダッシュ）

[Source](http://daredemopc.blog51.fc2.com/blog-entry-561.html)

