A club is a large, blunt object designed for hitting stuff, classically made of wood, but lately made of lightweight metals such as aluminum. Clubs of wood were likely among the first weapons that mankind ever used. A modern equivalent is a baseball bat, a table leg, or a carved piece of 2"x4".
"Use your club to beat the snot outta some desert scum, Ranger. It'll put some grit inta ya!" - Desert Ranger Drill Sergeant