Shields
From Halopedia, the Halo wiki
Summary
The Shields provide the player with some armor. It will protect their Health from damage until it is depleted, and it will regenerate. In Multiplayer you can have 50%, 100%, 200%, or 400% shield, or none at all. In Halo 1 it is shown at the top-right corner of the screen, in Halo 2 it is in the bottom-left. They have been changed since Halo: CE by making it charge faster and more resistance.
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