A defective script is a script that does not represent all the phonemic distinctions of a language.
Phoneme Omicron (letter) Defective verb Kufic Eta (letter) Upsilon Letter (alphabet) Epsilon Iota Varieties of Arabic Gemination Alpha (letter) Vowel length Omega Stress (linguistics) Digraph (orthography) Inflection Phoenician alphabet Consonant Aramaic language Diacritic Arabic alphabet Vowel Greek alphabet Writing system Ancient Greek Italian language Islam