Used in antique spring-powered mechanical watches and clocks, a fusee is a cone-shaped pulley with a helical groove around it, wound with a cord or chain which is attached to the mainspring barrel.

What is a fusée flare?

A flare, also sometimes called a fusée, is a type of pyrotechnic that produces a bright light or intense heat without an explosion. Flares are used for distress signaling, illumination, or defensive countermeasures in civilian and military applications.

How do you spell fusée?

or fu·zee. a wooden friction match having a large head, formerly used when a larger than normal flame was needed. a red flare light, used on a railroad as a warning signal to approaching trains.