The spelling of NNK can be confusing due to its unique pronunciation. In IPA phonetic transcription, it is represented as /ɛn ɛn keɪ/. The first two letters, "en," represent the sound of the letter "n" while the "k" at the end represents the sound of "kay." The duplication of the "n" sound in the first syllable gives this word its peculiar pronunciation. NNK is a challenging word to remember how to spell, but with the use of phonetics, it becomes more accessible to learn.