Every sport has its unwritten rules: traditions, customs or codes of conduct that are followed by players, coaches and referees even if they're not officially in the rule book.
As you will see in this article, hockey is full of these. Many, but certainly not all of them, involve fighting, something that is treated differently in the NHL than it is in any other professional sport in North America.
Here is a look at 15 unwritten rules in the NHL. Feel free to comment about the ones I have included or to add any you feel I may have missed.
I hope you enjoy this look at 15 of hockey's unwritten rules.