In Feng Shui, it is said that coins represent the element metal, and thus symbolise wealth. If you string 3 I-Ching coins together onto a red thread, you can place them into the wealth sector of your home, next to a cash register or even onto the accounts books in your business, to increase prosperity and wealth.
Three I-Ching coins may also be used for reading the I-Ching - one side of the coin is named Yin and the other side Yang. Through reading the 3 coins, and comparing them with the ancient Chinese Trigrams, one can read into their life and use the ancient advice of the oracle to determine how to harmonise and improve it. The I-Ching coins are made from brass.
I have my set of coins under the front doort mat. My finances are running well these days.