How Do You Spell CEN X-3?

Correct spelling for the English word "CEN X-3" is [sˈɛn ˈɛks θɹˈiː], [sˈɛn ˈɛks θɹˈiː], [s_ˈɛ_n ˈɛ_k_s θ_ɹ_ˈiː] (IPA phonetic alphabet).