Abstract: Faced with the necessity to establish a mechanical connection between the components of a supporting structure, a great many techniques and devices have been developed. This invention adds to the existing repertory a joint where a plurality of elongated members, positioned in a circular configuration, is held together by a link which embraces them all at once, thus eliminating the need for separate fastening devices on each and every single member. The elongated members protrude from the joint at predetermined angles projecting towards adjacent joints in a predetermined distance, thereby defining in shape and size entire structures. The joints may be secured against rotation and shifting, individually by means of pins or keys, or collectively by fitting trigonal, tetragonal or pentagonal panels between a corresponding number of joints.