"Store thing" is spelled as such due to the pronunciation of the initial consonant cluster. The /st/ sound is phonetically realized by aspirating the /s/ and releasing it into a voiceless /t/. This amalgamated sound is represented in the phonetic alphabet as /st/. Similarly, the word's vowel pronunciation is represented by a diphthong, /ɔɪ/, which is a combination of the open-mid back rounded vowel sound /ɔ/ and the near-close near-front rounded vowel sound /ɪ/. Thus, the correct IPA phonetic transcription for "store thing" is /stɔɪr θɪŋ/.