Yoruba Alphabet & Orthography

Standard Yoruba uses 25 letters, three of which — ẹ, ọ, and ṣ — are unique to the language and marked with a dot beneath the base letter ^[2]. These letters represent sounds that exist in Yoruba but have no single-character equivalent in the Latin alphabet as used for English or French.

Two additional distinctive features of Yoruba phonology are represented using digraphs — pairs of letters — rather than single characters. The labial-velar stops /gb/ and /kp/ are each written as two letters but pronounced as single simultaneous sounds: the lips and the back of the tongue close at the same moment. These are among the most immediately distinctive sounds in Yoruba to speakers of European languages, and they appear in common words such as 'egbe' (group) and 'kpe' (to call).

Because Yoruba is a tonal language, the alphabet must represent not only consonants and vowels but also the pitch of each syllable. The three tones — high, mid, and low — are indicated using diacritical marks placed above vowels.

In practice, tone marks are frequently omitted in everyday writing — text messages, social media, informal correspondence. Readers rely on context to disambiguate. This has led to ongoing debate among Yoruba language scholars and educators about whether tone marking should be made compulsory in all published materials, or whether the current informal norm is a natural feature of a living language adapting to modern communication.

Yoruba has both oral and nasal vowels. When a vowel is nasalised, the air passes through the nose as well as the mouth, producing a distinct sound. In the standard orthography, nasalisation is indicated by an 'n' following the vowel: 'an', 'en', 'in', 'on', 'un' ^[2]. This convention differs from the approach taken in some other West African orthographies and has been a point of historical debate — some linguists have advocated for a tilde (ã) above the vowel instead, as used in Portuguese and several African orthographies.

Nasalised vowels interact with tone in complex ways. The combination of tone mark and nasalisation marker can make some Yoruba words appear heavily annotated to unfamiliar readers, which is part of the reason that informal writing tends to strip out these marks.

For most of the 20th century, the special characters of the Yoruba alphabet — ẹ, ọ, ṣ, and their tone-marked variants — were a practical obstacle. Typewriters lacked the necessary keys; early computers required custom workarounds. Many books and newspapers printed during this period used approximations: 'e' for 'ẹ', 'o' for 'ọ', 's' for 'ṣ'.

The Unicode standard, which from the 1990s onwards encoded virtually every character needed for the world's writing systems, transformed this situation. Every letter and diacritical mark in the Yoruba alphabet is now fully represented in Unicode and supported by modern operating systems and applications. Keyboard input methods for Yoruba have been developed for iOS, Android, and desktop platforms. The barriers that once made accurate Yoruba typography prohibitively difficult have, in principle, disappeared — though adoption of tone marking in everyday digital communication remains inconsistent.