Figure skating jumps
Jumps are referred to by how many times the skater turns in the air. One revolution (one and a half for the Axel) is a "single" jump. Two revolutions (two and a half for the Axel) is a "double" jump. Three revolutions (three and a half for the Axel) is a "triple" jump. Four revolutions (four and a half for the Axel, although this has never been done in competition) is a "quadruple" or "quad" jump. The first triple jump landed in competition was a loop jump. It was landed by Dick Button in 1952. The first quadruple jump landed in competition was a toe loop jump. It was landed by Kurt Browning in 1988. Currently, men in world-class competition usually attempt a full set of triples and sometimes one or two quadruple jumps in their free skating programs. Triple Axels are rare for ladies, and quadruple jump attempts even more so.
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.