Abstract: A base panel is mounted to glass with metal strips and magnets. The magnets and metal strips are shaped to mate with each other for easy alignment of the sign. The panel includes an aperture behind which a sliding panel is mounted in a set of guide tracks. The sliding panel has lettering on it which may be viewed through the aperture in the base panel. The lettering showing through the aperture depends upon the position of the sliding panel. A magnetic stop holds the panel in one position.