Abstract: A warning and information sign comprising a warning triangle and an information sign carrier and having at one corner thereof a hanger hook enabling a mounting of the sign over the upper edge of any desired side window of the car, and which hanger hook is formed as a double hook comprising two U-shaped hook loops arranged with the openings thereof facing each other and which loops are integral over a web portion which is bent in an angle rearwardly from the openings of said loops such that the lower hook loop, which is not used as a hanger for the moment, is free from the side window of the car or provides a support thereagainst when the sign is hung by the opposite hook loop.