The spelling of the word "balli" can be explained using IPA phonetic transcription. The first syllable "ba" is pronounced as /bɑː/ with a long "a" sound. The second syllable "lli" is pronounced as /li/ with a short "i" sound. The combination of these sounds creates the spelling of "balli." While the spelling may seem unusual, it is a common trend in the English language for words to have unique spellings based on their pronunciation.