Backbone

: It encloses and protects the spinal cord, which is the critical link for nerve signals between the brain and the rest of the body.

In anatomy, the backbone, or spinal column, is the central axis of the skeleton. Composed of 26 serially arranged bones called vertebrae, it extends from the base of the skull to the pelvis. Its primary functions include: backbone

Beyond biology, "having a backbone" refers to a person's level of confidence, emotional strength, and willingness to stand by their convictions. : It encloses and protects the spinal cord,