What part of the spine does the term "coccyx" refer to?

The term "coccyx" specifically refers to the lowest section of the spine. It is commonly referred to as the tailbone and is situated at the very base of the vertebral column. The coccyx is made up of several fused vertebrae (typically four) and serves an important role in supporting the weight of the body when sitting, as well as providing attachment sites for various muscles, tendons, and ligaments. Understanding the coccyx's position is crucial for comprehending human anatomy and for training programs focused on running mechanics and overall body movement, as injuries or issues in this area can affect posture and running efficiency.