currency
Currency in Marsilion is the Florin, a gold coin worth approximately 50 USD in the real world. ((OOC: to avoid making a complex economic simulation, we're just sticking with a fixed value))
Smaller denominations exist in the form of the Deciflorin, Centiflorin, and Milliflorin, worth $5, $0.50, and $0.05 respectively.
Other civilizations on the planet use their own currencies, but exchanges are generally available at trading guilds or financial institutions.