The Hebrew word niytsots means a spark or a glittering flash. It refers to the tiny, ephemeral particle of fire that flies from a flame or from striking metal. The word evokes the fleeting, fragile nature of something that burns brightly for an instant and then is gone. It may also refer to a blossom or flower in some contexts.
In Isaiah, niytsots is used as a powerful metaphor for the self-destructive nature of human pride and idolatry. The strong man who trusts in his own works becomes like tinder, and his work becomes a spark — together they burn with no one to quench the fire. This imagery teaches that human achievement apart from God is ultimately self-consuming. The spark represents the inevitable, uncontrollable consequences of rebellion against the Creator.