For these reasons, EOF, or end-of-file, was used colloquially and conventionally as a three-letter acronym for control-Z instead of SUBstitute.
fɔːɹ ðiːz ɹˈiːzənz, ˈiːɑːf, ɔːɹ ˈɛndʌvfˈaɪl, wʌz jˈuːzd kəlˈoʊkwɪəli ænd kənvˈɛnʃənəli æz ɐ θɹˈiːlˈɛɾɚɹ ˈækɹənˌɪm fɔːɹ kəntɹˈoʊlzˈiː ɪnstˈɛd ʌv ˌɛsjˈuː bˈiːstˈɪɾuːt.