Doubts in "Epitaph of Stevinus". I have attached the link for the image- http://1.bp.blogspot.com/_YthztMsYjr4/TMB3Wmis2fI/AAAAAAAABR4/xBmLusI58AU/s400/epitaphofstevinus.png I can understand that the weight of the body should be proportional to the length of the line. What I can't understand is this- What does those letters "M N O... etc " indicate? Why is that enclosed? Thanks in advance.