I came across this stitch in an old booklet of crochet and knit information.
The instructions for the first row contain an error; it states to work in the fourth chain from hook, but you should begin in the third chain. I found correct instructions in another old book. That book however, did not contain Row 2, or that the repeat is from Row 2.
Chain an odd number
Row 1: Insert hook into 3rd chain and *pull up a loop, yarn over hook; pull up another loop through same chain, yarn over hook; pull another loop through same chain. You should have a total of 6 loops on your hook. Yarn over and pull through all 6 loops, chain 1. Skip 1 chain.*
Repeat from * to end of row. Turn.
Row 2: Chain 2. *Insert hook into second stitch (after turning chain) pull up a loop, yarn over hook; pull up another loop through same chain, yarn over hook; pull another loop through same chain. You should have a total of 6 loops on your hook. Yarn over and pull through all 6 loops, chain 1. Skip 1 chain.*
Repeat from * to end of row. Turn
Repeat from Row 2
This looks the same on both sides, so would be good for a scarf or other item where the back will be visible.