 The Philadelphia Flyers used a special white third sweater for their 50th anniversary in the 2016–17 season.As hockey originates as an outdoor winter sport where players wore sweaters, this terminology has been retained to describe what is probably the most recognized element of a team's equipment (which is the only element which is mass marketed to the public).Most NHL sweaters (jerseys) display the team's primary logo in the center of the chest, while some also display secondary logos on the shoulders.