The spelling of the word "SPINI" is based on the phonetic transcription of its pronunciation. In IPA, "SPINI" is transcribed as /ˈspɪni/. The first syllable "SPI" is pronounced with a short "i" sound, similar to "pit" or "hit". The second syllable "NI" uses a long "i" sound, just like "knee" or "piece". The final "I" in "SPINI" also uses the same long "i" sound. The spelling of "SPINI" is a good example of how phonetics can guide spelling in English.