Abjads

A script that represents consonants as full letters and treats vowels as optional diacritics or leaves them unwritten, per Daniels and Bright. Belongs here: Arabic Script, Hebrew Square Script, Aramaic Alphabet, Phoenician Script, the ancestor script behind most of this family's later members, Syriac Alphabet, Sogdian Script, Old Uyghur Alphabet, and Ancient South Arabian Script. Does not belong here: an alphabet that writes vowels as full letters, or an abugida that marks vowels with an attached diacritic rather than omitting them.