Money, money, money!
The money Aang tries to buy the Waterbending Scroll with, and the stone coins the Earth Kingdom army uses to fight are both based on ancient Chinese coins.
Note the other cool coins shapes.
Earliest Chinese round coins:
The earliest round coins appeared in 350 BCE. These coinds are called 半兩 ban liang, which means half a liang. A liang is the Chinese ounce, consisted of 24 銖 zhu, and was the equivalent of about 16 grams.
“When Qin united the world, it made two sorts of currency:
that of yellow gold, which was called yi and was the currency of the higher class; and that of bronze, which was similar in quality to the coins of Zhou, but bore an inscription saying Half Ounce, and was equal in weight to its inscription.”
Not to be confused with the sycee - also known as yuanbao 元宝 - the Chinese gold or silver ingot.







