The type of pulley attached to an overhead structure and used to change the direction of force is called a fixed pulley.

Here's why:

* Fixed: The pulley is fixed to a stationary point, like an overhead structure. This means the pulley itself doesn't move.

* Direction Change: The main function of a fixed pulley is to change the direction of the force applied. You pull down on the rope, but the weight being lifted goes upwards.

Example: Think of a flagpole. The pulley at the top of the pole is fixed. When you pull down on the rope, it changes direction and raises the flag.

Let me know if you'd like to learn more about other types of pulleys!