ˈiː nˈaɪn ɪz ɐnˈʌðɚ nˈeɪm fɚðɪ ˈɪnfɪnətdᵻmˈɛnʃənəl ɐfˈaɪn lˈaɪ ˈældʒᵻbɹə ˈɔːlsoʊ æz ˈiː ˈeɪt plˈʌs ɔːɹ ˈiː ˈeɪt wˈʌn æz ɐ wˈʌnnˈoʊd ɛkstˈɛndᵻd ˈiː ˈeɪt ɔːɹ ˈiː ˈeɪt lˈæɾɪs kˌɔːɹɪspˈɑːndɪŋ tə ðə lˈaɪ ˈældʒᵻbɹə ʌv tˈaɪp ˈiː ˈeɪt.
E9 is another name for the infinite-dimensional affine Lie algebra  (also as E8+ or E8(1) as a (one-node) extended E8) (or E8 lattice) corresponding to the Lie algebra of type E8.