American handball
American handball, known as handball in the United States and sometimes referred to as wallball (although the term "one-wall handball" is being adopted to avoid confusion), is a sport in which players use their hands to hit a small, rubber ball against a wall such that their opponent(s) cannot do the same without the ball touching the ground twice or hitting out of bounds. The three versions are four-wall, three-wall and one-wall (sometimes known as wallball or international fronton).