The correct spelling of the word "dost number" is "dost-namber". The IPA phonetic transcription for "dost-namber" is /dɒst ˈnʌmbər/. The term "dost-namber" is commonly used in Indian English and refers to a close friend's phone number. In Hindi, "dost" means friend and "namber" means number. It is important to use the correct spelling in written communication to avoid confusion and misinterpretation.