The international cecogram symbol, a white-on-black pictogram depicting a person using a white cane, should be placed on the exterior of any cecogram. It should measure . Furthermore, it should be indicated in writing on the exterior that the letter or parcel is indeed a cecogram.International Bureau of the Universal Postal Union. Convention Manual. Berne, 2018, vol I, art 16-002.1.3, p 29. Retrieved 2 October 2019.
