The spelling of the word "tiatto" can be confusing due to the unusual combination of letters. However, the pronunciation is straightforward when using IPA phonetic transcription. The first syllable "ti" can be pronounced as /ti/, which is similar to the sound of the letter "T" followed by "ee." The second syllable "at" is pronounced as /æt/, which is a short "a" sound followed by a "t" sound. Finally, the ending syllable "to" is pronounced as /təʊ/, which is a combination of a "t" sound and a long "o" sound.