The word "ATYS" is spelled with four letters: A-T-Y-S. Using IPA phonetic transcription, the pronunciation of "ATYS" is /ˈeɪtɪs/. The first sound, /eɪ/, is pronounced as the long 'a' sound in "day," followed by the sound of /t/ and /ɪ/, which is similar to the short 'i' sound in "hit." The final sound, /s/, is pronounced as the unvoiced 's' sound. Overall, the spelling of "ATYS" accurately reflects its pronunciation based on the rules of English phonetics.