The I-cord BO, or i-cord bind off is a decorative bind off. It finishes your bind off edge with an i-cord which creates a neat finish.
How to work an I-cord BO
Cast on: Cast on 2 stitches (or desired number).
Set up: Slip the cast on stitches to left needle.
Repeat: *K3, slip those 3 stitches back to needle. K2, k2tog-b. Slip 3 stitches back to left needle. Rep from * until all stitches on left needle have been worked.
Finishing: Use left needle to (pull second stitch over first) 2 times. Cut yarn and pull through.