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SHADDAH (TASHDID)
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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
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:
