sentences:  Because the Perso-Arabic script is an abjad writing system (with a consonant-heavy inventory of letters), many distinct words in standard Persian can have identical spellings, with widely varying pronunciations that differ in their (unwritten) vowel sounds.Thus a romanization paradigm can follow either transliteration (which mirrors spelling and orthography) or transcription (which mirrors pronunciation and phonology).The Latin script plays in Iran the role of a second script.