Cyklar is a Swedish word that means "bicycles". A bicycle, also called a pedal cycle, bike, push-bike, or cycle, is a human-powered or motor-powered assisted, pedal-driven, single-track vehicle. It typically has two wheels, a frame, pedals, handlebars, and a saddle or seat for the rider to sit on. Toe-clips and toestraps and clipless pedals help keep the foot locked in the proper pedal position and enable cyclists to pull and push the pedals. Technical accessories include cyclocomputers for measuring speed, distance, heart rate, GPS data, etc. Other accessories include lights, reflectors, mirrors, racks, trailers, bags, water bottles and cages, and bell. Bicycle lights, reflectors, and helmets are required by law in some geographic regions depending on the legal code.