The word "KARBU" can be spelled using the International Phonetic Alphabet (IPA) phonetic transcription system as [ˈkɑːrbu]. The first letter "K" corresponds to the phoneme /k/, which is a voiceless velar stop. The second letter "A" represents the vowel sound /ɑː/, which is an open back unrounded vowel. The letter "R" denotes the consonant /r/, which is an alveolar trill. The letter "B" stands for the consonant /b/, which is a voiced bilabial plosive. The vowel sound /u/ is represented by the letter "U", which is a close back rounded vowel.