The Dollar Sign Was First Used in 1785: Here’s another fun money fact: The official adoption of the dollar sign in the U.S. can be traced back to 1785, when it evolved from the Spanish symbol for pesos. It’s believed the $ originated from the abbreviation PS, which was used to indicate Spanish pesos in the Americas. Gradually the “S” came to be written over the “P,” eventually morphing into the dollar sign we know today.