What term describes a central point or pin on which something balances or turns?

The term that describes a central point or pin on which something balances or turns is "pivot." When an object rotates or moves around a point, that point serves as the pivot, allowing for movement in a stable manner. The concept of a pivot is fundamental in understanding how levers and other mechanical systems function.

In this context, a pivot allows an object to rotate efficiently by providing a point of balance. The correct response highlights the essential role of the pivot in facilitating motion while maintaining stability. Understanding the pivot's role in mechanics aids in grasping broader physics concepts related to torque, balance, and rotational dynamics.