Railgun

Railgun may refer to: 
*The enemy ability from Final Fantasy XIII.
*The enemy ability from Final Fantasy Record Keeper.
*The weapon from Final Fantasy Explorers.
==Etymology==
A railgun is an electromagnetic projectile launcher based on similar principles to the homopolar motor. A railgun uses a pair of parallel conductors, or rails, along which a sliding armature is accelerated by the electromagnetic effects of a current that flows down one rail, into the armature and then back along the other rail.