Pronunciation: [ˌe͡ɪt͡ʃˌɛlˈə͡ʊ] (IPA)
Correct spelling for the English word "HLO" is [ˌe͡ɪt͡ʃˌɛlˈə͡ʊ], [ˌeɪtʃˌɛlˈəʊ], [ˌeɪ_tʃ_ˌɛ_l_ˈəʊ] (IPA phonetic alphabet).
Correct spelling for HLO