The word "SUPPLIONI" is spelled with a double "L" and a single "I". In IPA phonetic transcription, it would be pronounced as /sʌpliˈoʊni/. The letter "U" is pronounced as an "ʌ" sound. The first "L" is a clear "L" sound while the second "L" is a dark "L" sound. The "I" is pronounced as "ee". Overall, the spelling of "SUPPLIONI" follows common English language pronunciation rules and can be pronounced accurately using IPA transcription.