What does 2 Kings 13:16 mean?

Elisha said, 'Open the east window.' Jehoash opened it. Then Elisha said, 'Shoot!' So he shot. Elisha said, 'That's the Lord's arrow of victory, the arrow of victory over Aram! You will completely defeat the Arameans at Aphek.' 2 Kings 13:16 - Modern Text Bible

(The act of shooting the arrow is a prophetic sign that God will give Israel victory over their enemies.)