Easton's Bible Dictionary (1897)
Jehovah my banner, the title given by Moses to the altar which he erected on the hill on the top of which he stood with uplifted hands while Israel prevailed over their enemies the Amalekites (Ex. 17:15).
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
JEHO'VAH-NIS'SI (Jehovah my banner), the name given by Moses to the altar which he built as a memorial of the discomfiture of the Amalekites. Ex 17:15.
Hitchcock's Bible Names (1869)
the Lord my banner