Curling tongs
A heated rod, with or without a clamp, that hair is wrapped around to make curls or waves.
Also: curling iron, wand
Curling tongs, or a curling iron, are a heated barrel that a section of hair is wound around for a few seconds to set a curl. Clamp tongs hold the end of the hair; a wand has no clamp, and the hair is wrapped by hand. Thin barrels make tight ringlets, thick ones loose waves. Heated tongs go back thousands of years, but Marcel Grateau's heated irons in 1870s Paris made the deep, regular marcel wave.