Which term describes a metal plate that creates sparks when struck by flint?

The correct term for a metal plate that creates sparks when struck by flint is "frizzen." This component is essential in flintlock firearms, where the frizzen is a hardened steel plate that, when struck by flint, produces the sparks necessary to ignite the gunpowder. The flint is held in a hammer that brings it down against the frizzen, and this action generates the required heat to ignite the priming charge in the pan, leading to the firing of the weapon.

Understanding the function of the frizzen is crucial for comprehending the mechanics of flintlock firearms and the evolution of ignition systems in firearms. Other terms listed, such as trigger plate and lock plate, refer to different parts of a gun's mechanism, while a firing plate may not be directly relevant to the spark generation process in flintlocks. This distinction highlights the specific role that the frizzen plays in the overall operation of the firearm.