A band of metal called a 'torc' was commonly worn during the European Iron Age on what part of the body?

A torc, also spelled torq or torque, is a large rigid or stiff neck ring in metal, made either as a single piece or from strands twisted together. The great majority are open at the front, although some had hook and ring closures and a few had mortice and tenon locking catches to close them. Many seem designed for near-permanent wear and would have been difficult to remove.

Torcs are found in the Scythian, Illyrian Thracian, Celtic, and other cultures of the European Iron Age from around the 8th century BC to the 3rd century AD. For the Iron Age Celts the gold torc seems to have been a key object, identifying the wearer as a person of high rank, and many of the finest works of ancient Celtic art are torcs. The Celtic torc disappears in the Migration Period, but during the Viking Age torc-style metal necklaces, now mainly in silver, came back into fashion. Torc styles of neck-ring are found as part of the jewellery styles of various other cultures and periods.