The term "sacro" often refers to the sacrum, a triangular bone located at the base of the spine. It connects the spine to the pelvis and consists of five fused vertebrae. The sacrum plays a crucial role in supporting the weight of the upper body and providing stability during movement. In anatomy, "sacro" can also be part of various terms related to the sacrum, such as sacroiliac joint, which connects the sacrum to the iliac bones of the pelvis. This joint is important for transferring weight and forces between the upper body and the legs during activities like walking and running.