Currently, nine numbers have not been worn by any player in Bruins history: 66, 69, 78, 85, 87, 96, 97, 98, and 99 (which is universally retired). With players born even in the late 2000s already old enough to enter the NHL, and with so many low numbers retired, it is likely that many of these numbers will begin to be taken soon.
The future of the Bruins promises new stories and legends, and it will be interesting to see which numbers become synonymous with success in the coming years.