On UST? That is MD, the letters are reduced in size. MD can appear as a :shelving" effect where there is a layering seen, the bottom will be the actual width of the letter/number. At other times the effect is at an angle, I call this a "shearing effect" which is what you see here. Study this little ditty I made up the other day:


Those may help down the line.



Those may help down the line.























