What is the bone with two sciatic notches?

The bone with two sciatic notches is the pelvis, specifically the ilium, which is the largest bone in the pelvis. The greater sciatic notch is located on the posterior side of the ilium, while the lesser sciatic notch is situated below it. These notches serve as passageways for nerves and blood vessels, as well as for structures connecting the lower limb to the pelvis.