[5] Nso uses an orthography based on the General Alphabet of Cameroon Languages (AGLC).
An orthography had initially been created before being modified to follow the recommendations of the AGLC.
[7] Nso uses 23 digraphs ⟨bv, dz, gb, gh, gv, gw, jw, kf, kp, kw, mb, mf, mt, mv, nj, ns, nt, ny, ŋg, ŋk, ŋw, sh, ts⟩ and 7 trigraphs ⟨ghv, mbv, ndz, nsh, ŋgv, ŋgw, shw⟩.
Diphthongs are noted ⟨ay, ey, əy, oy, uy, iy⟩.
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