Yhvh Nissîy (יְהוָה נִסִּי) means The LORD Is My Banner. A compound divine name from YHVH + nēs (banner, standard, signal pole). Moses built an altar by this name after the battle with Amalek.
Exodus 17:15: 'Moses built an altar and called it The LORD is my Banner.' The name commemorates Israel's victory over Amalek while Aaron and Hur held Moses' arms aloft. The raised hands with the staff of God functioned as a battle standard — a rallying point. When the banner was raised, Israel prevailed; when it dropped, Amalek gained ground. God Himself is our banner — the standard around which we rally, the signal that identifies whose army we belong to. Isaiah 11:10: 'the Root of Jesse will stand as a banner for the peoples.' Christ is the ultimate banner.