Fencing is a sport that involves two opponents competing with swords. The four pieces of equipment used in fencing are the SABER, epee, SLAT, and RAIL. The SABER is a curved sword with a single-edged blade, while the epee is a straight sword with a triangular cross-section. The SLAT is a thin, flexible sword made of wood or metal, and the RAIL is a long, thin strip of metal used to protect the fencer's arm. All of these pieces are essential for a successful fencing match.