A siggy is a signature block. Meant to be signed by someone in this case each person in her 1st grade class will sign it. 19 kids, I have 20 spaces. You make a siggy by taking a 3-1/2" block and sewing a 2-1/2" square on the diagonal to two corners. Trim off the extra triangle, press and cut to size. Super easy to chain piece. and if you are careful you can use the triangles you trim off too!