The word "MYN" is an older spelling of the modern English word "mine." The pronunciation of this word is /maɪn/ in the International Phonetic Alphabet (IPA). The reason for the different spelling can be traced back to the Middle English period, where the "i" and "y" were interchangeable. As the English language evolved and standardized, the spelling of "mine" became more prevalent, but the older spelling still persists in some archaic texts and historical contexts.