The spelling of the word "LOMU" can be explained using IPA phonetic transcription. The initial sound is /l/, which is produced by placing the tip of the tongue on the alveolar ridge and vibrating the vocal cords. The following sound is /o/, a mid-back rounded vowel produced by rounding the lips and raising the back of the tongue. The final sound is /mu/, which is produced by rounding the lips for the /m/ and then opening them for the /u/, a mid-back rounded vowel. Therefore, the word "LOMU" is spelled using three distinct phonemes.