This list can go on for long, but in most sports, you need a helmet. I have the hockey answer though
Player: A CSA approved helmet, elbow pads and shoulder pads, hockey pants, neck guard, gloves, slash guards (for a short cuff glove) shin guards, a cup and skates.
Optional: mouth guard, in some leagues full masks, and in the Nhl, visors
Goalie: Specialy made goalie cup, goalie pants, goalie pads, chest protector, blocker, catcher, helmet, skates and a neck guard.
Optional: Neck guard that appears above the jersey. It is attached to the helmet
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