The spelling of the word "ATPPRT" may seem confusing, but it can be broken down using IPA phonetic transcription. The "A" is pronounced as the short "a" sound, the "T" is pronounced as the voiceless alveolar stop, the "P" is pronounced with a puff of air, the double "P" indicates a longer puff of air, the "R" is pronounced as an alveolar trill, and the final "T" is pronounced as the voiceless alveolar stop. Therefore, "ATPPRT" is pronounced as "a-t-p-p-r-t."