This sound is /d/, as in the word 'dash.' This is a voiced stop phoneme, so we have to be even more vigilant not to land on a vowel sound after it. It’s not /duh/ or even /doo/; just /d/. The International Phonetic Alphabet (IPA) represents this phoneme with the following symbol: d. In the early stages of the curriculum, Once’s instructional content represents the sound with a symbol that is made by typing ‘d’ in a specialized font. This specialized orthography helps beginning readers (pre-kindergarten students through early elementary grades) learn letter-sound correspondence more quickly. By the middle stages of the curriculum, the specialized orthography is phased out and replaced by letters in a serif font.