I think the reference was to the language https://en.wikipedia.org/wiki/Esperanto https://en.wikipedia.org/wiki/Esperanto, which is interesting and strange. (I

I think the reference was to the language https://en.wikipedia.org/wiki/Esperanto https://en.wikipedia.org/wiki/Esperanto, which is interesting and strange. (I am not sure to what extent it is unique, but it is probably the best known among the conlangs.)