Abstract: A new and improved apparatus for signalling accuracy of a path of a projectile moving on a floor or ground surface includes an audible signal assembly located above and near floor or ground level. The audible signal assembly provides an audible signal when a target element of the assembly is hit by a projectile that moves along the floor or ground. A support assembly supports the audible signal assembly above and near enough to the floor or ground, such that the target element of the audible signal assembly can be hit by the moving projectile. The support assembly includes two triangular-shaped end units in which bases of the end units are supported by the floor or ground surface. Traverse rod supports are connected to the end units near apices of the end units. A traverse rod extends traversely between the end units and is supported by the traverse rod supports. The audible signal assembly is supported by the traverse rod.