It is a weekly stitch event at Pintangle. Sharon teaches you the stitch, you work it and share the result on your blog (or somewhere else on the internet). You can read all about it here.
I am still catching up on the stitches I have missed, as well as giving them new numbers that fit into my stitch collection.
This stitch is the one I will number as 142. It is called Interlaced Cable Chain Stitch and you can learn it here from Pintangle.
On my TAST Reference Chart:
I must admit I'm not too fond of this stitch....