3 - the number of times this year the Flyers have allowed five goals in a single period.
They did so in the second period of each of these games:
* A 7-0 loss against Washington on November 1.
* A 7-2 loss at Chicago on December 11.
* Last night's 7-3 loss to the Sharks.
Hilariously, each of those games either saw the Flyers holding a lead (they led Chicago and San Jose 2-1 going into the second period of those respective games) or at least be within striking distance (they trailed Washington 1-0) before things got ugly.
By comparison, the Flyers themselves have done this once this year: in the third period of a 5-4 win over Columbus on December 19.
For fun, here's a graph showing how many times the Flyers as well as their opponents have scored a given number of goals in a single period.