Jehovah Nissi: The Lord is my banner. Think about what a banner is. A flag is a banner. At sporting events, we often wave a banner of some kind showing which team we support. The staff of Moses became a banner for the Israelites. Moses' staff being held high where the Israelites could see during the battle was a reminder to them that God is present with them. It was a sign of God's power; a sign of encouragement. It also reminded them that it was God that gave Moses the authority.
Whose banner do you wave?