An illuminated sign assembly having opaque indicia arranged on a translucent back-lighted panel, the assembly comprising an opaque frame consisting of an elongated rectangular enclosure with four walls, a bottom enclosure and an open top. The back-lighted panel extends across the open top of the enclosure, with the outer surface of the translucent panel being secured in place by a frame means having an inwardly extending opaque surface which masks the illuminating means from the translucent panel so as to indirectly illuminate the panel.