PU loop from bind off and k2tog is used as part of making a particular buttonhole. This is one of the many, many ways or situations to pick up a loop. I differentiate picking up a loop from picking up a stitch when there is no actual stitch being picked up. (And cast ons and bind offs aren’t really true stitches.)
In Jill Wolcott Knits® patterns, I often use the term “pull up” in place of “pick up” as I think the term is clearer, because you’re pulling up the thread to work it.
PU is the abbreviation used for pick up.
BO is the abbreviation used for bind off.
k2tog is the abbreviation used for knit 2 together.
In this case, the “PU loop from bind off” is worked as part of a knit 2 together to close a gap created by the bind off done on the previous row. By knitting the loop together with the next stitch on your left needle, the gap is closed and the stitch count doesn’t change.
PU loop from bind off and k2tog
Use the right needle to pick up a loop of the bind off done on the previous row and put it on the left needle. Knit the loop and the next stitch together as a k2tog. The stitch count doesn’t change and the gap created by the bind off is closed.
Pattern Specific Variations to PU loop from bind off and k2tog
Sometimes, I include technique variations that are for specific patterns. I always include directions for specific techniques in the pattern itself, so be sure to also read any patterns you’re working on closely.
PU loop from bind off and k2tog Variation for Ashland
Use your right needle to pick up a loop of the bind off at the end of the buttonhole and put it onto the left needle. Knit the loop together with the next stitch to close the gap at the end of the buttonhole.