The spelling of the word "NPU" uses the International Phonetic Alphabet (IPA) transcription to reflect its pronunciation. The IPA symbols for NPU are /ɛnpjuː/. The first symbol /ɛ/ represents the open-mid front unrounded vowel sound, followed by the consonants /n/, /p/, and /j/. The symbol /uː/ represents the close back rounded vowel sound. Thus, "NPU" is pronounced as "en-pyoo" and accurately spelled using IPA transcription to indicate the correct pronunciation.