Wayne Gretzky's number 99 has been retired league-wide, although the Edmonton Oilers and Los Angeles Kings separately retired Gretzky's number.
Some of the numbers honoured by the Blues remain in circulation, while others have been removed from circulation without being officially retired.
It is very rare for a team to reissue a retired number, and usually requires a special circumstance, such as a number being requested for a family member (such as Bobby Hull asking the Phoenix Coyotes to allow his son Brett to wear Bobby's number 9), or the player for whom the number was retired coming out of retirement himself (such as Mario Lemieux).
In cases of franchise relocation, the handling of existing retired numbers is at the discretion of team management.
This is a complete list of numbers retired by the National Hockey League (NHL).
A retired number is a jersey number that is taken out of circulation by a team as a way of honouring a former member of that team who wore that number.
The first team to retire a number was the Toronto Maple Leafs, which retired Ace Bailey's number 6 on February 14, 1934, prior to an All-Star game organized in his honour.
Currently in the NHL, there are 122 retired numbers, 7 former retirements, and 23 honoured numbers.
Most of the numbers retired by the Hartford Whalers and Quebec Nordiques were put back in circulation when those franchises relocated and became the Carolina Hurricanes and Colorado Avalanche, respectively, although the Hurricanes keep Gordie Howe's number 9 unofficially retired.
The Arizona Coyotes had a policy of retaining the numbers retired when the franchise was the Winnipeg Jets but has reversed it after the Phoenix Coyotes were sold and became the Arizona Coyotes.
Honoured numbers are similar to retired numbers, except that they remain available for use by other players.
Presently, only the Toronto Maple Leafs, the Calgary Flames, and the St. The Philadelphia Flyers have also unofficially retired number 31 in honour of goaltender Pelle Lindbergh, ever since his tragic death in 1985.