High Quality Content by WIKIPEDIA articles! The spelling of Gwoyeu Romatzyh (GR) can be divided into its treatment of initials, finals and tones. GR uses contrasting unvoiced/voiced pairs of consonants to represent aspirated and unaspirated initials in Chinese: for example b and p represent IPA and . The letters j, ch and sh represent two different series of initials: the alveolo-palatal and the retroflex sounds. Although these spellings create no ambiguity in practice, readers more familiar with Pinyin should pay particular attention to them: GR ju, for example, corresponds to Pinyin zhu, not ju (which is spelled jiu in GR).