Abjad

An abjad ( or abgad) is a writing system in which only consonants are represented by letter signs, leaving the vowels to be inferred by the reader (unless represented otherwise, such as by diacritics). This contrasts with alphabets that provide graphemes for both consonants and vowels. The term was introduced in 1990 by Peter T. Daniels.

Extends: [Abjad writing systems](https://wikipedia.org.ai/Abjad writing systems), [Arabic orthography](https://wikipedia.org.ai/Arabic orthography), [1990s neologisms](https://wikipedia.org.ai/1990s neologisms)