The term 'Back Column' is a reference to the spine, which is the central column of bones that runs down the back of the human body. The crossword solution for this term is SPINAL, which is a six-letter word. The spine is made up of 33 vertebrae and is responsible for providing support and protection for the SPINAL cord, which is the bundle of nerves that runs through the spine and carries signals between the brain and the rest of the body.