NettetR, or r, is the eighteenth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide.Its name in English is ar (pronounced / ˈ ɑːr /), plural ars, or in Ireland or / ˈ ɔːr /.. The letter r is the eighth most common letter in English and the fourth-most common consonant, after t , …