The word "NNITI" may seem unusual, but its spelling can be easily explained using the International Phonetic Alphabet (IPA). The first letter "N" represents the nasal consonant sound /n/, followed by a double letter "N" indicating that the nasality of the previous sound is held for an additional syllable. The third letter "I" represents the sound /ɪ/, which is a short vowel sound. The final letter "T" represents the voiceless alveolar stop sound /t/, which concludes the pronunciation of this uncommon word.