Wiktionary
soliferrum
n. An ancient Iberian heavy iron javelin. It was designed to be thrown a short distance of up to 30 meters.
Wikipedia
Soliferrum
Soliferrum or Soliferreum ( Latin: solus, "only" + ferrum, "Iron") was the Roman name for an ancient Iberian ranged pole weapon made entirely of iron. The soliferrum was a heavy hand-thrown javelin, designed to be thrown to a distance of up to 30 meters. In the Iberian language it was known as Saunion.