What is the deep socket in the hip bone where the femur is attached known as?

The deep socket in the hip bone where the femur is attached is known as the acetabulum. It is a cup-shaped structure that forms the hip joint, allowing for the articulation of the femur and providing stability and mobility to the hip. The acetabulum is formed by the fusion of three pelvic bones: the ilium, ischium, and pubis.