AXiD = Alpha Xi Delta
670 = my Quill # from my chapter
That's how I would sign EVERYTHING when I was in school (you know, posters, cups, doodling in class, etc.)...but instead of writing "AXiD" I'd draw letters and then put my # underneath. Of course the letters and numbers had the little "dots" on them. I had a friend who was a graphic design major, and he told me one day that they were making new fonts in class, and they designed the "sorority girl font" (yes, they really named it that) which had the letters with the dots on them.