The spelling of "mNPQ" may seem unusual, but it follows the International Phonetic Alphabet (IPA) guidelines. The first letter "m" represents a bilabial nasal sound /m/, followed by the letter "N" representing a velar nasal sound /ŋ/. The letter "P" represents a voiceless bilabial plosive sound /p/, and "Q" represents a voiceless uvular stop sound /q/. Although uncommon in everyday language, the IPA is used to transcribe sounds accurately for linguistic research and teaching purposes.