The spelling of the word "NN" can be quite confusing at first glance. However, it is actually quite simple when using the International Phonetic Alphabet (IPA) phonetic transcription. The word "NN" is spelled with two letters representing the two nasal consonants /n/ and /n/. The IPA symbol for /n/ is a straight vertical line with a diagonal line at the top, while the symbol for /n/ is a vertical line with a loop at the bottom. Therefore, the spelling of "NN" reflects the two nasal sounds pronounced together.