Final answer:
The greater sciatic notch is a U-shaped indentation on the posterior margin of the ilium, separating the ischial spine and the lesser sciatic notch.
Step-by-step explanation:
The greater sciatic notch is a large, U-shaped indentation located on the posterior margin of the ilium, superior to the ischial spine. It separates the ischial spine and the lesser sciatic notch. The greater sciatic notch plays an important role in the anatomy of the pelvis and is relevant in the study of human biology and anatomy.