“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,Great Miracle Happened There.