A sign cube system having a substantially square-shaped box portion having four substantially planar side surfaces, one closed end and one open end, and a wire support having a substantially square-shaped portion which is inserted into the open end of the box portion and a stem extending perpendicular to and vertically downward from a center of the square-shaped portion. The wire support may be attached to an upright bracket and inserted into a substantially hollow upright member of a retail merchandise display or the wire support may be attached to a stringer which extends horizontally between two upright members of the retail merchandise display.