Long vowels "aa" "ii" and "uu" - Long voiwels lengthen the short vowels
Shaddah - doubled letter This is a repeater sign which indicates a double letter which must be distinctly pronounced twice, (double consonant)
Sukun (jazm) Link sign - Sukun (jazm) resembles a semi-circle which appears over a consonant. its function is to link its previous letter and form a single sound. No word can begin wiht a sukun.