There are seven Canadian teams in the National Hockey League and in 2014 stamps were issued with each team's logo on the Zamboni and centre ice.
The Zamboni is an ice resurfacer that was first manufactured in 1949 by a guy named Frank Zamboni. (Zamboni is the trademarked name for the ice resurfacer, but I'm sure, no matter what brand or make is used it is known as a 'Zamboni' - rather like facial tissues are always called Kleenex.)
The NHL requires two machines to resurface the ice between periods. The ice is resurfaced before the game, after warm-ups, between periods, during playoffs, and when the game is over. With two resurfacing machines, it takes three minutes to complete the rink, each making four full passes up the ice. With one, it takes between six and seven minutes with eight full passes up the length of the ice. Before the machine was invented, it used to take over an hour with several men using scrapers, towels, hoses, and squeegees.