The spelling of "NPPLA" can be explained using the International Phonetic Alphabet (IPA) transcription system. The first letter "N" is pronounced as the sound "en" /ɛn/, followed by the letter "P" which is pronounced as the sound "pee" /pi/. The next two letters "PL" are pronounced together with the sound "pluh" /plʌ/ and finally, the last letter "A" is pronounced as the vowel sound "aah" /ɑː/. The combination of these sounds creates the distinct spelling of "NPPLA".