It is derived from Pe̍h-ōe-jī and since 2006 has been one of the phonetic notation systems officially promoted by Taiwan's Ministry of Education.It is nearly identical to Pe̍h-ōe-jī, apart from: using ts tsh instead of ch chh, using u instead of o in vowel combinations such as oa and oe, using i instead of e in eng and ek, using oo instead of o͘, and using nn instead of ⁿ.The Taiwanese Romanization System uses 16 basic Latin letters (A, B, E, G, H, I, J, K, L, M, N, O, P, S, T, U), 7 digraphs (Kh, Ng, nn, Oo, Ph, Th, Ts) and a trigraph (Tsh).The IETF language tags register nan-Latn-tailo for Tâi-lô text.The tones used by Tâi-lô should use Combining Diacritical Marks instead of Spacing Modifier Letters used by bopomofo.