Final answer:
The piece of equipment used at the top of the Space Needle for safety against electrical storms is a lightning rod, which directs electrons to the ground.
Step-by-step explanation:
On top of the Space Needle in Seattle, Washington, about 184 meters off the ground, the item installed for safety against electrical storms is the lightning rod. When an electrical storm occurs, the electrons can find their way to the ground through this device.
A lightning rod is a conductor with a sharply pointed end that collects excess charge on a building caused by an electrical storm and allows it to dissipate into the air. Such rods prevent the electric field between the cloud and the ground from becoming large enough to produce a dangerous lightning bolt in the region around the rod.