Abstract: A portable lightweight illuminated sign assembly for either carrying on one's person or placing on a window for advertisement and the like. The plastic housing is rectangular in shape to support a rectangular transparent plastic face plate which carries a message illuminated by at least one fluorescent light source and energized by either a D.C. source when portable and by either D.C. or A.C. current when affixed to a window. Suction cups attachable to loops or hooks are provided on the housing adjacent to the face plate for affixing to a window. A hook element positioned on the housing on both sides and centered between the attachment loops or hooks enables the use of body straps for supporting the portable sign assembly on one's torso.