That symbol is the little bow-and-arrow shape people sometimes discover on a $20 bill. Despite how unusual it looks, it is not a secret government code, a counterfeit warning, or a hidden message printed by the U.S. Treasury. It is an example of a privately applied chop mark. Money changers and currency handlers have historically used such symbols after inspecting a note and deciding it was genuine. The exact design can vary because there is no universal system controlling these marks.

The practice has much older roots. Chinese merchants famously stamped silver coins that had been examined for weight and authenticity. A coin could accumulate several marks as it moved from one merchant to another, creating a visible record of repeated verification. Historical examples of U.S. Trade Dollars with numerous Chinese chop marks show how widespread this tradition became in international commerce.

American dollars later became particularly common in international trade because they were widely recognized and circulated outside the United States. Money changers in parts of Asia and elsewhere could stamp notes as a quick visual indication that the bill had been checked. The marks could be letters, geometric shapes, animals, stars, arrows, or other designs. A similar mark might therefore mean something different depending on who applied it.

So if you discover a small bow-and-arrow symbol on your $20, there probably isn’t a mystery waiting to be uncovered in the government’s printing process. Instead, you may be looking at a tiny piece of the bill’s journey through the global economy. Someone, somewhere, handled that note and considered it worth verifying. The mark survived while the bill continued traveling, eventually reaching your wallet. What first looks like damage may actually be evidence of the fascinating life ordinary money can have after leaving the printing press.