http://www.ehow.com/guide_11-http://www.ehow.com/guide_11-hobbies-games.html.htmlwww.ehow.comhttp://www.ehow.com/how_5116566_knit-yarn-over.htmlIn knitting, a yarn over is used to make a small, decorative space or a button hole. Find out how yarn overs are often abbreviated as YO, and why they are often paired with K2TOG with help from a knitting instructor in this free video on knitting a yarn over. Published on 6/24/2009