What is "shell stitch"

1. n. a crochet stitch

2. v. make by shell stitching

A shell stitch (or fan stitch) is a crochet motif often used as a border around other patterns or in staggered rows to create a distinctive fabric pattern. Shell stitches take the shape of arcs and semicircles, hence the name. Shell stitches are often used as edging for crocheted items such as Afghan blankets and sweaters.