1. Starting with your dominant hand in a "5" handshape (thumb extended, other fingers closed)
2. Moving your hand in a semi-circular motion, starting at your chin and moving down and outward in front of your chest.
Imagine you're drawing a "U" shape with your hand, starting at your chin and moving downwards.
It's important to remember that sign language varies by region and language, so this is the sign for "U" in ASL.