What do UK stamps not have on them that other countries do?

The second required element, at least for stamps intended to be used on international mail, is the name of the country. The first postage stamps, those of the United Kingdom, had no name. In 1874 the Universal Postal Union exempted Great Britain from its rule which stated that a county's name had to appear on their postage stamps, so a profile of the reigning monarch was all that was required for identification of Britain's stamps.[1] To this day the UK remains the only country not required to name itself on its stamps. For all other UPU members, the name must appear in Latin letters.