A language may represent a given phoneme by combinations of letters rather than just a single letter.
ɐ lˈæŋɡwɪdʒ mˈeɪ ɹˌɛpɹᵻzˈɛnt ɐ ɡˈɪvən fˈoʊniːm baɪ kˌɑːmbᵻnˈeɪʃənz ʌv lˈɛɾɚz ɹˈæðɚ ðɐn dʒˈʌst ɐ sˈɪŋɡəl lˈɛɾɚ.