In computer science, the SI prefixes kilo-, mega- and giga- were historically used in certain contexts to mean either the first three powers of 1024 (1024, 10242 and 10243) contrary to the metric system in which these units unambiguously mean one thousand, one million, and one billion.
ɪn kəmpjˈuːɾɚ sˈaɪəns, ðə sˈiː pɹˈiːfɪksᵻz kˈiːloʊ, mˈɛɡə ænd ɡˈɪɡə wɜː hɪstˈɔːɹɪkli jˈuːzd ɪn sˈɜːʔn̩ kˈɑːntɛksts tə mˈiːn ˈiːðɚ ðə fˈɜːst θɹˈiː pˈaʊɚz ʌv wˈʌn θˈaʊzənd twˈɛnti fˈoːɹ wˈʌn θˈaʊzənd twˈɛnti fˈoːɹ, tˈɛn θˈaʊzənd tˈuːhˈʌndɹɪd fˈoːɹɾi tˈuː ænd tˈɛn θˈaʊzənd tˈuːhˈʌndɹɪd fˈoːɹɾi θɹˈiː kˈɑːntɹɛɹi tə ðə mˈɛtɹɪk sˈɪstəm ɪnwˌɪtʃ ðiːz jˈuːnɪts ʌnæmbˈɪɡjuːəsli mˈiːn wˈʌn θˈaʊzənd, wˈʌn mˈɪliən, ænd wˈʌn bˈɪliən.