The original set of emoji used in Japanese phones had ten characters reserved for country flags, but as you can imagine ISO were very much not keen to include o

The original set of emoji used in Japanese phones had ten characters reserved for country flags, but as you can imagine ISO were very much not keen to include one particular set of countries to the exclusion of all the others, or to specify a particular flag design for a particular country. The solution they went with was to add 26 "regional indicator symbol" characters, and if you use those flag-code characters to spell an ISO country-code, rendering software is supposed to look up the current flag of the named country and display it. If they went to such lengths to avoid adding flags to the spec, imagine how much pushback you'd get for trying to add company logos.