If you are looking for the NFL rule, rule 3-21-2 states "A forward pass is a pass that intially moves forward (to a point nearer the opponents goal line) after leaving the passer's hands and before touching another player."
NFL rule 3-21-4 covers backwards pass, "A backwards pass is any pass that is not a forward pass." Supplamental note "A pass parallel to a yard line or an offensive player moving parallel to it as the snap is considered backward."
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