Orb of Light
From Destinypedia, the Destiny wiki
Orbs of Power are a type of item within Destiny. Orbs of Power recharge a player's Super meter, and are released whenever an ally uses a Super. This encourages players to use Supers frequently when in groups. Sometimes gear can have perks where collecting orbs of power heals players. Killing a normal enemy typically yields one orb, while killing a major will yield four. Ward of Dawn, which is a purely defensive super, generates about two orbs of power upon activation; however, the Defender class has other ways to generate orbs as well.
Besides using supers, artifacts are also useful for generating orbs of power by other means, such as melee or grenades. In Destiny 2, multikills using a Masterwork weapon also generates orbs, either in the Crucible or in normal PvE.
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