How many fused vertebrae does the coccyx have?

The coccyx is made up of four fused vertebral bones, these are caused because of the formation of the vertebrae through fusion of the intercalated discs and the spinal vertebral bone numbering c7-11 these bones help to maintain your posture when standing and sitting this allows for your back to feel less pressure and alleviates the pain of long sitting or standing situations such as speaking in a large public event.