Graphic designers refer to the Italic and Roman forms as "single decker a" and "double decker a" respectively.
ɡɹˈæfɪk dɪzˈaɪnɚz ɹᵻfˈɜː tə ðɪ ɪtˈælɪk ænd ɹˈoʊmən fˈɔːɹmz æz "sˈɪŋɡəl dˈɛkɚɹ ˈeɪ" ænd "dˈʌbəl dˈɛkɚɹ ˈeɪ" ɹᵻspˈɛktɪvli.