The little triangle markings on the sewing pattern are called notches. They are symbols that help you match your pattern pieces. Cutting these notches may be a little daunting. Following the pattern directions right will stop you from connecting your pieces upside down or back to front. It will prevent you from sewing your pieces wrongly that you would frustratingly need to undo them later. Sewing notches can be represented by a triangle pointing out, pointing in, or a diamond pointing in both directions. You can find them as an outline or solid shapes. You can also find the single, double, or even triple. Pattern makers vary in using these notches. There are two ways of cutting the notches; cut them in or out. But there is no right or wrong way to do it. Do what you think would work best for you. Some sewists suggest always cut outwards to lessen the risk of making a mistake. Also, when you cut it too far in, it may weaken the seam. You can find sewing notch cutters that can accurately cut ¼ inch notches on the pattern paper or fabric. You can also use small scissors to cut the notches on fabrics as there is a strong possibility of cutting too far in the seam with large scissors. When cutting your notches, make sure that you are consistent with the method that you use so that your pieces are sure to match up.