- Alternate uses, see Ro (disambiguation)
- Ro did not begin with attempting to rival or supplant any other language whatever, either natural or artificial, nor was it suggested by any of them. Unexpectedly came the thought: "How strange it is that there is nothing in the appearance of a written or printed word that gives the slightest hint of its meaning. Why should a word not be a picture? A new word, never seen before would then, like a painting seen for the first time, convey at least some of the meaning to the eye."
A common criticism of Ro is that it can be difficult to hear the difference between two words; usually one consonant makes the word completely different. That may have been why Ro didn't catch on as well as other constructed languages, such as Esperanto.