The spelling of the word "sindou" is based on the phonetic sounds that make up the word. In IPA (International Phonetic Alphabet), the pronunciation of the word is /sɪndu/. This means that the 's' sound is followed by a short 'i' sound, then a 'n' sound, a short 'u' sound, and ends with a voiced 'd' sound. With this knowledge, we can spell the word "sindou" with confidence and accuracy. Phonetic transcriptions provide a useful tool for speakers of different languages to communicate and understand pronunciation.