Ɱ
The letter Ɱ (minuscule: ɱ), called M with hook, is a letter of the Latin alphabet based on the letter M. Its minuscule ɱ is used to represent a labiodental nasal in the International Phonetic Alphabet.
In Americanist phonetic transcription, the lowercase ɱ is used for transcribing a voiced labiodental nasal stop and the uppercase Ɱ for a voiceless labiodental nasal stop. [1]
Use on computers
The majuscule and the minuscule are located at U+2C6E and U+0271 in Unicode, respectively.