The word "hists" is spelled with the letter 's' at the end, despite its pronunciation suggesting a 't' sound. In IPA phonetic transcription, the word is spelled /hɪsts/. The 's' at the end represents a voiceless alveolar fricative sound, while the 't' sound at the end is simply an aspiration that occurs due to the release of pressure following the pronunciation of the 's'. This is a common phenomenon in English pronunciation, where the spelling may not always accurately reflect the spoken sound.