Latinum is a rare silver liquid used as currency throughout the Ferengi Alliance as well as other species. Unlike other currencies, latinum cannot be replicated.
To make latinum a monetary unit, the liquid is suspended in gold to create "gold-pressed" latinum in the form of slips, strips, bars, and bricks. There is speculation by some that gold is worthless compared to latinum.
Latinum has been shown to be less harmful to humanoid life than the element mercury.