“Jehovah Nissi” should not be translated “The LORD My Banner” “Nissi” should be translated as “My Miracle.”
Exodus 17:14. And the LORD* said to Moses, “Write this in a book for a memorial and repeat it in the ears of Joshua, for I shall utterly blot out the remembrance of Amalek from under heaven.” 15. And Moses built an altar and called the name of it Adonai-Nissi, The LORD* is My Miracle. 16. For he said, “Because the LORD* has sworn that Yah will have war with Amalek from generation to generation.”
This word Nes, is the same as on the Hannukah dreidel, “Nes Gadol Haya Sham,” A Great Miracle Happened There.