This is the same meaning of "escape" encountered in URL encodings, C language strings, and other systems where certain characters have a reserved meaning.
ðɪs ɪz ðə sˈeɪm mˈiːnɪŋ ʌv "ɛskˈeɪp" ɛŋkˈaʊntɚd ɪn jˌuːˌɑːɹɹˈɛl ɛŋkˈoʊdɪŋz, sˈiː lˈæŋɡwɪdʒ stɹˈɪŋz, ænd ˈʌðɚ sˈɪstəmz wˌɛɹ sˈɜːʔn̩ kˈæɹɪktɚz hæv ɐ ɹɪzˈɜːvd mˈiːnɪŋ.