What are Mortise & Tenon Joints?
a hole or recess cut into a part which is designed to receive a corresponding projection (a tenon) on another part so as to join or lock the parts together. “a mortise and tenon joint“Definitions from Oxford Languages
join securely by using a mortise and tenon. “the top plate of the rudder assembly can be mortised to the top of the rudder post”Definitions from Oxford Languages