How Do You Spell HRTFPI?

Correct spelling for the English word "HRTFPI" is [ˌe͡ɪt͡ʃˌɑːtˈiːˌɛfpˌiːˈa͡ɪ], [ˌe‍ɪt‍ʃˌɑːtˈiːˌɛfpˌiːˈa‍ɪ], [ˌeɪ_tʃ_ˌɑː_t_ˈiː__ˌɛ_f_p_ˌiː__ˈaɪ] (IPA phonetic alphabet).