Arabic Worksheet 53
The Sukun
One often notices a smaller semicircular on sign on top of letters.

It should be noted that such signed letters are always preceded by a letter with a vowel and they cannot be pronounced by their own. When sukun letters are joined to previous letters with a vowel, they are pronounced very lightly or with a half sound, e.g.

The sign is called the sulun but the letter with the sukun sign - is referred to as "sakin"