A quadruple double in basketball is when a player gets 10 or more in four different statistical categories. The categories with which a player can achieve a quadruple double are points, rebounds, assists, steals, and blocks. If a player gets 10+ in any of four of those five categories, they have accomplished a quadruple double.
The short answer, yes. A quadruple double is quite rare in basketball, but has happened a few times in the past. The last time it happened in the NBA, however, was in 1994. As the overall quality of the players in the NBA has improved, it has become increasingly more difficult for players to accomplish the quadruple double. The only four players to have done it are: Nate Thurmond in 1974, Alvin Robertson in 1986, Hakeem Olajuwon in the 1990 season, and David Robinson in 1994. The lack of players that have accomplished it makes the feat all the more impressive.