Pilum

The pilum (Latin: [ˈpiːɫʊ̃]; pl.: pila) was a javelin commonly used by the Roman army in ancient times. It was generally about 2 m (6 ft 7 in) long overall, consisting of an iron shank about 7 mm (0.28 in) in diameter and 600 mm (24 in) long with a pyramidal head, attached to a wooden shaft by either a socket or a flat tang.