Nicknames are Ferro Rod, Metal Match, Misch Metal or Flint Steel.
The main rod itself is a Ferrocerium alloy. Originally invented in 1903. It takes its name from its two primary components: iron (from Latin: ferrum), and the rare-earth element cerium, hence the name "ferro-cerium". A modern ferrocerium firesteel is composed of an alloy of rare-earth metals called mischmetal (containing approximately 20.8% iron, 41.8% cerium, about 4.4% each of praseodymium, neodymium, and magnesium, plus 24.2% lanthanum).
The resulting product creates a reliable fire lighting tool.