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FEATURED BOOKS ON BACK PAIN FROM BARNES & NOBLE.COM:
S1 through S5
The letter "S" stands for "sacrum." So S1 refers to the 1st sacral bone, S2 to the 2nd sacral bone, S3 to the 3rd sacral bone, and so on, until S5, which is the last sacral bone. S1 is at the top and S5 is at the bottom, with the numbers in between going down the body in numerical order. For example, S3 is below S2, S4 is below S3, and so on.
A reference to the five (S1, S2, S3, S4, S5) vertebrae (bones that form an opening in which the spinal cord passes) that are near an area of the body known as the sacrum, a large bone in the lower part of the spine that is shaped like a triangle.
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