On April 21, 1787, the Continental Congress of the United States authorized a design for the nation's first coin, the Fugio Cent.  It was the first design for the penny and it was named the Fugio Cent because of it's image of the sun shining down a sundial.  The coin was designed by Benjamin Franklin and had the inscription "Mind Your Business."

Wikipedia

The phrase "Mind Your Business" and the images on the coin form a rebus (A puzzle in which words are represented by combinations of pictures, words and individual letters) which loosely reads as 'time flies, do your work.'  According to Wikipedia, "Some historians believe that the word "business" was intended literally here, as Franklin was an influential and successful businessman. Given Franklin's history publishing aphorisms, it may have been intended to mean both monetary and social business."

The Fugio Cent was minted until 1789 when it was replaced by the penny with the motto "E pluribus unum" from the Great Seal of the United States.

[Source: Wikipedia]