Rein

Riding reins (top); driving reins (bottom)

Reins are used to direct a horse (or other animal) when riding or driving. They are attached to a bridle's bit or noseband and are made of leather, nylon, or other materials. Reins are used to give subtle commands or cues—also known as rein aids—to ask for a turn, a slower speed, a halt, or to go backwards.^{[1]: 402 [2]: 178}