Abstract: A sign made of relatively heavy paper, cardboard, plastic or the like is adapted for convenient mounting on the interior rear view mirror support of automotive vehicles. The sign is positioned between the mirror and the rear surface of the front windshield and includes an integral hook which is bent rearwardly out of the plane of the sign to engage a mirror support of the type which projects roughly parallel to the windshield. For the type of mirror support which is adhesively connected to the rear surface of the windshield and projects roughly rearwardly thereof, the hook is bent rearwardly and downwardly, exposing a hook-shaped opening through which the mirror support is extended. Access into the opening is permitted by means of a slit extending from the opening to the peripheral edge of the hanger sign. A bending score is directed horizontally across the sign for use in bending the sign, if desired, when minimal clearance is provided between the rear surface of the windshield and the back of the mirror.