United States currency is full of symbolic design choices and cryptic markings. First issued in 1861 as a demand note, the $20 bill is one of the most commonly used denominations. Over the years, the $20 bill has undergone numerous facelifts, from changing portraits and seals to the addition of color-shifting ink and security threads. Today’s version packs in more symbols than most people may realize. If you’ve ever wondered what those little letters, numbers, and emblems really mean, her...
