The object that moves around a fulcrum is called the lever arm.

Here's a breakdown:

* Fulcrum: The fixed point around which a lever rotates.

* Lever arm: The rigid object that rotates around the fulcrum. It can be a straight bar, a curved object, or anything that can pivot.

* Effort: The force applied to the lever arm.

* Load: The force being moved by the lever arm.

Let me know if you'd like more detail on any of these concepts!