Which NHL player wore number 99, the only number retired league-wide?

Wayne Gretzky is the NHL player whose number 99 was retired league-wide.

The NHL retired number 99 for every member club on February 6, 1999, honoring Gretzky’s extraordinary career. No NHL team can issue the number to a new player, making it different from a team retirement, which applies only to one franchise. Gretzky wore 99 for the Edmonton Oilers, Los Angeles Kings, St. Louis Blues, and New York Rangers.

The decision followed his final NHL season and made Gretzky the only player with a league-wide retired number. Several teams had already retired numbers for their own legends, including Toronto’s number 9 for Gordie Howe and Montreal’s number 4 for Jean Béliveau, but those honors were club-specific. Number 99 is therefore a unique league-wide tribute rather than merely an Oilers or Kings retirement.