Detonator

Small explosive device used to trigger a larger explosion

Detonator

A detonator or blasting cap is a small explosive device or small quantity of explosive, which can be combined with a fuse, used for detonating a larger charge of high explosive. Detonators come in a variety of types, depending on how they are initiated (chemically, mechanically, or electrically) and details of their inner working, which often involve several stages. Types of detonators include non-electric and electric.

From Wikipedia, under CC BY-SA. More on occurri.