Slip Knot – sk
This is an abbreviation of slip knot but a slip knot is not usually referred to in a pattern.
How To Do A Slip Knot:
Step 1: Make a loop with the yarn.
Step 2: With your thumb and index finger, go through the loop.
Step 3: Pinch the tail end connected to the skein of yarn.
Step 4: Pull through the loop and tighten.
Slip Knot Instructional Video: