This is the James Norris Trophy Memorial Trophy. It is awarded annually to the National Hockey League's top "defense player who demonstrates throughout the season the greatest all-round ability in the position".
At the end of each season, members of the Professional Hockey Writers Association vote to determine the player who was the best defenseman during the regular season.
The trophy has been awarded since 1954. That means for the first 36 NHL seasons, there was no specific award to honor the the game's top defensman.
It would be a fun exercise to retroactively award the Norris Trophy to the league's top defensemen prior to 1954. And that's exactly what Chris Mizzoni did over at his blog Nitzy's Hockey Den.
Mizzoni's work is interesting. He determined Eddie Shore would have been a 6 time Norris winner, and Red Kelly would have won 5 consecutive Norris trophies including the one he actually did win in 1954.
Take a look at Chris' selections and offer him some feedback.