DurusulQuran  Lessons of Qur'an

SHADDAH  (TASHDID)  

This is a repeater sign which  indicates a double letter which must  be distinctly pronounced twice, (double consonant)

Example:


Can be analysis as 

                                               Bal.La                                           Rab.Bu

 

More Practice Exercise 

When a consonant letter, like in English irregular, innocent , occurs twice in a word , one after the other, (without a vowel sound in between), in Arabic it is written once with a  repeater sign which is placed over it .  Among two identical letters the first letter represents letter with   sukun  ,  and second letter having it own any short vowel.   Because of first letter having sukun the rule of sukun is operative.  Learn more about sukun
Example: