Coins are a traditional symbol of wealth and luck. The number of coins also has significance.

Three coins

Attract wealth as they represent the trinity of luck: heaven, earth and mankind. 

Five coins

Invoke the five "Emperors of the Universe" to protect against danger and attract wealth. The five coins also signify the five feng shui elements (metal, wood, water, fire, and earth) for a balanced and harmonious life. 

Six coins

Will help you to attain skills in networking and gaining support from influential people in your workplace.

Eight coins 

Very auspicious since the number eight sounds like "good fortune” in Chinese. It's also linked to the symbol of infinity which represents unending good things.

Nine coins

Signify the wholeness of the universe, and the unity between heaven and earth.