Johnathan sent a special signal to David by intentionally overshooting the mark.
1 Sam 20:36 And he said unto his lad, Run, find out now the arrows which I shoot. And as the lad ran, he shot an arrow beyond him. [37] And when the lad was come to the place of the arrow which Jonathan had shot, Jonathan cried after the lad, and said, Is not the arrow beyond thee?