This is a photo of the alternative to the Yarn Over increase that I used in Mr Greenjeans. I don't think there's an agreed upon name (or abbreviation) for it, but Emily Wessel of Tin Can Knits refers to it as a "knit under the bar" increase.
When you come to the point where you would otherwise make a Yarn Over, you simply make a knit stitch under the thread connecting the stitches before and after. Instead of a great honking buttonhole you get this nice, tidy decorative opening. Bonus: like the YO increase, it's fast and easy, especially compared to the more common Make 1 increase.
