ssk

Slip 2 stitches knitwise, knit these 2 stitches together through back loops. This is a single left-leaning decrease and is a counterpart to k2tog. It's tidy and easy to make.

Insert the right hand needle into the next stitch knitwise and slip it off the left hand needle onto the right hand needle, repeat this step once more, insert the left hand needle into both slipped stitches through the front loops from left to right so that the right hand needle is in the back and points left and away from you, wrap the yarn around the right hand needle and pull it through both stitches sliding the slipped stitches off and leaving a new stitch on the right hand needle.

ssk