The term 'sporting weapon' can refer to a variety of weapons used in sports, such as fencing. The four-letter solution for this term is 'epee, ' which is a type of fencing SWORD. Epee is a French word meaning 'SWORD, ' and it is the heaviest and longest of the three fencing swords. It is also the only one that allows for thrusting attacks. Epee fencing is a popular sport around the world, and it is an Olympic event.