Join together symbolizes a stitching technique which involves making small zigzag stitches with the purpose of securely fasten two fabric pieces together. This method provides strength and avoids the fabric from unraveling. The whipstitch may be used for a variety of sewing projects, such as hemming, sewing patches, or even making quilts.
It gives a neat and skilled look for the finished item.
whipstitch WordReferencecom Dictionary of English