Coin

A coin is a flat, usually disc-shaped piece of metal, which is or has been used as a form of currency among some cultures, such as the Ferengi and Humans.

Some types of coin include:
 * Dime
 * Looney
 * Penny

While cleaning up his bar, Quark found three coins on the floor of the second level and shouted angrily to Broik and another Ferengi waiter that they should leave because of their carelessness. 

In 2369, Nog paid with two coins for a jumja stick on Deep Space 9's Promenade.

That same year, Quark narrowly avoided an assassination attempt as Grand Nagus by bending over to pick up a coin dropped on the floor of his bar.