Used in precision woodworking, a dovetail joint is hard to pull apart. It is commonly found in boxes and drawers. A series of pins extending from the end of one board interlock with tails cut into the mating board. The pins and tails have trapezoidal shapes. A glued wooden dovetail joint requires no additional mechanical fasteners.
 Wikipedia. "Dovetail Joint." (Feb 25, 2019) en.wikipedia.org/wiki/Dovetail_joint.