We've learned about four of the ancient Chinese Six Ritual Jades:
Cong - earth, Bi - sky/heaven, Huang - North, Hu - West,
and Gui - East.
The last of the Six Ritual Jades was the Zhang.
This was a flat blade or axe, and it was used to mean "South".
![zhang - south](https://upload.wikimedia.org/wikipedia/commons/3/3e/%E4%B8%89%E6%98%9F%E5%A0%86_%E7%8F%8D%E5%AF%B6_%E7%8E%89%E7%92%A7_%E7%89%99%E7%92%8B_%E6%96%A7%E9%8B%A4%E5%99%A8_068.jpg)
(from: wikipedia - chinese jade)
Kid Facts - Blast from the past: Gates of Paradise