A bracelet is an article of jewelry that is worn around the wrist. The bracelet may serve a function, such as holding a wristwatch.  Some bracelets may also serve to hold other pieces of jewelry such as charm bracelets.   Medical and identity information is marked on some bracelets, such as allergy bracelets, hospital patient-identification tags, and bracelet tags for newborn babies. If a bracelet is a single, inflexible loop, it is often called a bangle. When it is worn around the ankle it is called an ankle bracelet or anklet. A boot bracelet is used to decorate boots. Bracelets can be made from a wide ray of materials from metal, leather, cloth, plastic or other materials and sometimes contain jewels, rocks, wood, shells, crystals, metal, or plastic hoops, pearls and many more materials.