Ziqqim refers to chains or fetters used to bind captives. The word appears in Isaiah in the context of God's promise to release prisoners — the chains of captivity will be broken by divine deliverance. Related to the verb zaqaq (to refine, purify).
The image of ziqqim (chains) being broken is a powerful metaphor for liberation in both the physical and spiritual sense. Isaiah's prophecy of release from fetters finds its ultimate fulfillment in Jesus Christ, who came to proclaim liberty to the captives (Luke 4:18) and whose resurrection broke the ultimate chains of sin and death.