A straight, curved or circular piece of metal used as jewlery for
piercings. Has a ball on each end that screws into the shaft. Can be made of
stainless steel, titanium or niobium. Sometimes acrylic plastics are used. The different shapes often get stupid nicknames, such as belly "ring" (a curved barbell);
horseshoe (circular barbell) or tounge "ring" or "stud" (a straight barbell). See also cbr.