It's called a drawer lock joint. There are others with the same name but don't lock like this one. Actually, quite easy to make. Only two cuts on the drawer front, three on the sides, typically done on the table saw with dado blades. The joint slides together from the vertical. The drawer bottoms fit in a groove, both in the sides and the drawer front which locks the joint from being able to move up or down. Great drawer joint if you are not using false drawer fronts, although, it works well for just boxes with loose fronts. Also works with lipped/beaded overlay drawer fronts. Hardwood is a better choice than softer species. Not a well known joint and under utilized.
Last edited by Hammer1; 11-19-2014 at 07:58 PM.