The term SPINAL BONE refers to two bones in the human body: the COCCYX and the VERTEBRA. The COCCYX, also known as the tailbone, is a small triangular bone located at the base of the spine. It consists of four fused vertebrae and is the remnant of a vestigial tail. The VERTEBRA, on the other hand, are the 33 bones that make up the spinal column. They are stacked on top of each other and provide support for the body while protecting the spinal cord. Together, the COCCYX and vertebrae form the backbone of the human body.