Gold is money in Civilization IV. It is used to maintain cities and units, and to buy many things. Gold is represented in the game by the gold icon (Image:Coins.png), which looks like two stacks of gold coins. For this reason gold is sometimes called "coins" by players; once gold is in the treasury it is also referred to as money. Gold is also the name for a tile resource (Image:Gold.png), and its associated trade resource. Gold should not be mistaken for commerce (Image:Coin.png), even though both use somewhat similar icons.