The informal rule commonly referred to as the Gretzky Rule in the National Hockey League actually encompasses two distinct historical elements associated with the legendary icon, though the most famous official rule change inspired by him involved mandatory player equipment regulations. During his peak dominance with the Edmonton Oilers, Wayne Gretzky famously preferred to station himself directly behind the opponent's goal line in an area immediately behind the net—a zone that quickly became known as his office because defenders were helpless to stop his quick passes and scoring setups from behind the goal line. While the league never banned players from skating behind the net, the actual official regulation often called the Gretzky Rule was introduced in 2013 to penalize players who deliberately remove their own helmets during fights or altercations to avoid facial injuries, mirroring a safety habit Gretzky famously practiced during his playing days to keep himself protected on the ice.