Overshield
From Halopedia, the Halo wiki
Summary
The overshield technology is used by the Covenant to enhance their Elite warrior's shields by a factor of three. It can be used by any Spartans that might come upon it. During multiplayer it is temporary and gradually deteriorates.
It looks simply like a ball of energy encased in a glass cube. Once the user breaks the glass container, the energy dumps directly into the nearest energy field and increases it for a limited time. This theory hasn't been proven, because hardly any Covenant technology has been recovered intact by UNSC forces.
While present in both Halo 1's campaign and multiplayer, in Halo 2 it can only be found in multiplayer.
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Images
http://img145.exs.cx/img145/4553/overshieldthumb1vo.jpg
