A bracelet is an article of jewellery that is worn around the wrist. It may have a supportive function, such as holding a wristwatch or other items of jewellery such as religious symbols or charms. 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. Colloquially, handcuffs are sometimes called bracelets. Bracelets can be manufactured 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.