Overcast symbolizes a stitching technique which involves making small in-out stitches in order to securely join two fabric pieces together. This method provides strength and avoids the material from coming apart. The overcast may be used for a range of sewing projects, like sewing the hem, sewing appliques, or even creating quilts. It gives a neat and professional look for the completed product.

5 Most Useful Basic Hand Sewing Stitches Stitch Clinic