Quad (figure skating)
A quad, or quadruple, is a figure skating jump with at least three but less than four revolutions. Most quadruple jumps have 3 1/2 revolutions; the quadruple Axel has 4 1/2 revolutions, although no figure skater to date has completed this jump in competition. The quadruple toe loop and quadruple Salchow are the two most commonly skated in the discipline. Quadruple jumps have become increasingly common among World and Olympic level men's single skaters, to the point that not having one in a program has come to be seen as a severe handicap. The first person to land a ratified quadruple jump in competition was Canadian Kurt Browning in 1988. In 2002, Miki Ando became the first woman to do so, and she remains one of only two women to have landed a ratified quadruple jump in competition.
Double (basketball)
Quadruple-doubles have only been possible since the 1973–74 season, when the NBA started recording both blocked shots and steals. It is often speculated by observers that other all-time greats, namely Oscar Robertson (all time triple-doubles leader with 181), Wilt Chamberlain, Bill Russell and Jerry West could conceivably have had quadruple-doubles. West's biography at NBA.com claims that he once recorded an unofficial quadruple-double with 44 points, 12 rebounds, 10 assists and 10 blocks. A biography of Wilt Chamberlain claims that he also recorded an unofficial quadruple-double in Game 1 of the 1967 Eastern Division Finals against the Boston Celtics, when he had 24 points, 32 rebounds, 13 assists and 12 blocks.