noun
striker; fire striker
A triangular piece of steel struck against flint to produce sparks for starting fires. Historical tool; now mainly encountered in historical or traditional contexts.
火打ち金と火打ち石を使って火をおこす方法を学んだ。
I learned how to start a fire using a striker and flint.
博物館に古い火打ち金が展
An old fire striker was on display at the museum.
火打ち石 is the flint that is struck against the 火打ち金 to create sparks.
Compound of 火打ち (hiuchi, 'fire striking') and 金 (kane, 'metal'). The exact historical derivation is uncertain, but the term straightforwardly describes the tool's function.