"What is this thing?"
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Orb refers to multiple subjects in the Metroid series. You may be looking for:
Blue orb, a light source on Tallon IV
Kinetic Orb, an object fired by Kinetic Orb Cannons
Kinetic Orb Cannon, a mechanism used to launch Kinetic Orbs
Kinetic Orb target, an object that stops a launched Kinetic Orb
Energy Capsule, known as an "orb" in Echoes and Hunters
Energy orbs, the power source of Mogenar
Orb, an artifact of the Bion race
Aeion Orb, a pickup that partially replenishes Samus's Aeion
Big Aeion Orb, a pickup that fully replenishes Samus's Aeion