chain stitch

Short definition from Wiktionary

Noun

1. 1
   A stitch like the links of a chain, used in crocheting.
2. 2
   An ornamental stitch like the links of a chain, used in sewing and embroidery.
3. 3
   A stitch in which the looping of the thread or threads forms a chain on the underside of the work; the loop stitch, as distinguished from the lock stitch.