Pronunciation: [ˈɑːtˈɑːtp] (IPA)
Correct spelling for the English word "RTARTP" is [ˈɑːtˈɑːtp], [ˈɑːtˈɑːtp], [ˈɑː_t_ˈɑː_t_p] (IPA phonetic alphabet).
Correct spelling for RTARTP