dart
Small metal-tipped missile that is thrown by hand at a dartboard.
barrel 
Wider part of the dart whose type is determined by its weight distribution (smooth, ringed or knurled design).
flight 
Feathers or synthetic material attached to the back end of the dart to provide stability during flight.
shaft 
Metal stem that is used to grip the dart to throw it.
point 
Metal pointed front end of the dart that sticks in the dartboard.