igniter

This term describes a mechanism that triggers a chemical or physical reaction, specifically combustion. In technical contexts, it refers to a precise hardware component like a spark plug or a heating element that initiates a flame in boilers, furnaces, or rocket engines. When used figuratively, the word describes a catalyst that sparks a sudden, often volatile, social or emotional eruption. It carries a connotation of rapid escalation, where a single small action leads to a large-scale consequence.