The composite mark illustrated in the drawing comprises a series of opaque letters standing upright and facing the observer. The sun or light source not shown but positioned above and to the right of the series of upstanding opaque letters causes a shadow to be formed at the base of said letters extending at an angle in a direction to the left and also toward the observer. As observed in perspective, the plane of the shadow is at right angles to the plane of the face of the upstanding letters which consists of "R", "E", "F", "L", "E", "X" and "X". The arrangement of the upstanding letters and the angular shadow and the precise double "X" ending is unique and distinctive.