Translations:Adventist Youth Honors Answer Book/Arts and Crafts/Knitting/20/en
From Pathfinder Wiki
The term "yarn-over" refers only to the act of wrapping the yarn around the needle, and not to the working of the next existing stitch. Yarn-overs are often used to increase the number of stitches, since knitting a yarn-over creates a new stitch where none existed previously, but does not use up a stitch on the needle. Yarn-overs are also common in eyelet and lace knitting, since they produce stable holes in the fabric.
