Since 1967, Bambara has mostly been written in the Latin script, using some additional phonetic characters. The vowels are "a, e, ɛ" (formerly "è"), "i, o, ɔ" (formerly "ò"), "u"; accents can be used to indicate tonality. The former digraph "ny" is now written "ɲ" when it designates a palatal nasal glide; the "ny" spelling is kept for the combination of a nasal vowel with a subsequent oral palatal glide. Following the 1966 Bamako spelling conventions, a nasal velar glide "ŋ" is written as "ŋ", although in early publications it was often transcribed as "ng" or "nk".