An Aramaic word for a large furnace or kiln — appearing most notably in Daniel 3, where King Nebuchadnezzar commands the 'fiery furnace' (attun nura) to be used to execute those who refuse to worship his golden image.
The furnace in Daniel 3 is one of Scripture's most powerful images of divine protection in the midst of persecution. Shadrach, Meshach, and Abednego enter the furnace at the cost of their lives rather than bow to an idol, and emerge untouched — with a mysterious fourth figure walking among them. The attun becomes a symbol of God's presence in the fire of trial (Isaiah 43:2). Early Christians saw this as a type of Christ's presence with His people in suffering, and the furnace story has provided courage to believers facing martyrdom across two millennia.