Concrete block for use in fence or building construction

A fence system comprising a plurality of wall panels consisting of blocks laid in courses, each of said blocks having opposed front and rear surfaces, opposed top and bottom surfaces, and a pair of opposed ends, the top and bottom surfaces being complementarily profiled to mutually interfit, and the end surfaces being shaped to permit a plurality of the blocks to be laid in a course with no mortar in between blocks in a course, said end surfaces are aligned to said front and rear surfaces at an angle that is not 90 degrees, a vertical stack of courses forming a wall panel, and an I-shaped column element at an end of said wall panel for joining said wall panel to an adjacent wall panel.