What defines the term "player" in the context of encroachment rules?

The term "player" in the context of encroachment rules specifically refers to individuals who are on the field of play and positioned on their side of the line of scrimmage. Encroachment occurs when a defensive player crosses the line of scrimmage before the ball is snapped, which can lead to a penalty due to the violation of the established rules intended to ensure fair play.

By defining "player" in this way, it emphasizes that only those players involved in the immediate action, specifically those on the defense or offense in their respective areas, are subject to encroachment penalties. This ensures clarity in the application of the rules and maintains the integrity of the game. In contrast, members of a team who are not on the field, such as substitutes or non-starters, do not take part in the encroachment scenario as they are not involved in the snap or play being executed.