A quad, or quadruple, is a figure skating jump with four or more, but fewer than five, revolutions. Most quadruple jumps have exactly four revolutions; the quadruple Axel has 4½ revolutions, although no figure skater to date has completed this jump, either in practice or in competition. The quadruple toe loop and quadruple Salchow are the two most commonly skated. The first quad Lutz was ratified in 2011.