sl st

Crochet Slip Stitch -- Join With a Slip Stitch to Form a Ring
Crochet Slip Stitch -- When your crochet pattern says "join with a sl st to form a ring," or "join with a slip stitch to form a ring," this photo shows an example of what your work should look like. Photo © Amy Solovay, Licensed to About.com, Inc.

Definition: Sl st is the crochet abbreviation for "slip stitch."

Learn How to Crochet a Slip Stitch

Examples: Ch 5, join with a sl st to form a ring -- This translates to "Chain 5, join with a slip stitch to form a ring." The picture shows an example of this.

If you would like to see step-by-step instructions with more pictures, please visit my tutorial for how to form a ring in crochet.