Fox wedging is a joinery technique for a mortise and tenon joint where the wedge is fitted into a sawn kerf in the tenon. As the tenon is driven into the mortise, the wedge flares the split tenon and locks it in place.
High definition version of the video below can be found here.
One commenter asked if I had bored a flared hole to match the flared tenon. I did not. But you can cut a dovetail-shaped mortise, as shown in the illustration at right, which makes for a very strong joint. In the case of the drawer pull, I felt that the extra strength wasn't necessary.
The illustration is from this website.
The music is "Somewhere Over The Rainbow" by Israel Kamakawiwo'ole.