Despite the "B" suffix of the route, it is the only suffixed route in NY 383's history—there has never been a "NY 383A".
dᵻspˈaɪt ðə "bˈiː" sˈʌfɪks ʌvðə ɹˈaʊt, ɪɾ ɪz ðɪ ˈoʊnli sˈʌfɪkst ɹˈaʊt ɪn ˌɛnwˈaɪ θɹˈiːhˈʌndɹɪd ˈeɪɾi θɹˈiː hˈɪstɚɹi—ðɛɹ hɐz nˈɛvɚ bˌɪn ˈeɪ "ˌɛnwˈaɪ θɹˈiːhˈʌndɹɪd ˈeɪɾi θɹˈiː ˈeɪ".