The spelling of the word "Rhoton" is based on the pronunciation of the letter "r". In IPA phonetic transcription, "r" is represented by the symbol /ɹ/. This sound is called the "alveolar approximant" and is produced by bringing the tip of the tongue close to the roof of the mouth. The spelling of "Rhoton" includes the letters "rh" which suggest a stronger emphasis on the pronunciation of the /ɹ/ sound. This emphasis may reflect regional or personal variations in pronunciation.