Because the bracket and brace characters of ASCII were assigned to "national use" code points that were used for accented letters in other national variants of ISO/IEC 646, a German, French, or Swedish, etc. programmer using their national variant of ISO/IEC 646, rather than ASCII, had to write, and thus read, something such as
bɪkˈʌz ðə bɹˈækɪt ænd bɹˈeɪs kˈæɹɪktɚz ʌv ˈæski wɜːɹ ɐsˈaɪnd tuː "nˈæʃənəl jˈuːs" kˈoʊd pˈɔɪnts ðæt wɜː jˈuːzd fɔːɹ ˈæksəntᵻd lˈɛɾɚz ɪn ˈʌðɚ nˈæʃənəl vˈɛɹiənts ʌv ˌaɪˌɛsˈoʊ slˈæʃ ˌaɪˌiːsˈiː sˈɪkshˈʌndɹɪd fˈoːɹɾi sˈɪks, ɐ dʒˈɜːmən, fɹˈɛntʃ, ɔːɹ swˈiːdɪʃ, ɛtsˈɛtɹə. pɹˈoʊɡɹæmɚ jˈuːzɪŋ ðɛɹ nˈæʃənəl vˈɛɹiənt ʌv ˌaɪˌɛsˈoʊ slˈæʃ ˌaɪˌiːsˈiː sˈɪkshˈʌndɹɪd fˈoːɹɾi sˈɪks, ɹˈæðɚ ðɐn ˈæski, hædtə ɹˈaɪt, ænd ðˈʌs ɹˈiːd, sˈʌmθɪŋ sˈʌtʃ ɐz