The ilium, ischium, and pubis combine to create the coxal bone, which is part of the pelvic girdle.
When standing or sitting, the pelvic girdle's main function is to support the upper body's weight and transfer it to the lower limbs. It protects the internal pelvic organs and acts as a site of attachment for the muscles of the trunk and lower limbs.
Ilium: The wide, outward-pointing part of the hip bone (the crest of the pelvis).
Pubis: The hip bone's lower, backward portion.
Ischium: A bone that contributes to the formation of the hip.
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