Dollar

The dollar was a common human term for currency. Variations of the dollar were used by the United States of America, Canada, Australia, Belize, Hong Kong, and many others.

In 2275, Montgomery Scott used the phrase "dollars to doughnuts" to describe how sure he was. 

In 2063, Zefram Cochrane admitted to being motivated by dollar signs. (TNG movie novelization: Star Trek: First Contact)

The Sands Hotel used dollars. (DS9 episode: "His Way")