This is what the sukoon can look like. 

 

It is used to show the absence of a vowel. It simply means do not make the sound of a vowel on that letter.

For example, the letter Fa فْ with a sukoon is pronounced as ff, I didn’t say fa, I didn’t say fu, I didn’t say fi. I said it with no vowel, fff.

Another example, sheen شْ with a sukoon, shh

Ta تْ with a sukoon, tt.

Tha ثْ with a sukoon, thh

Jeem جْ with a sukoon, je.

Similar to English words. For example, the word Bat, the ‘t’ has no vowel. Transliterated to Arabic it looks like this بَتْ Bat.
If I put a fatha it will be bata بَتَ, a kasra will be bati بَتِ and a dammah is batu بَتُ . With a sukoon it’s bat بَتْ.

 

Lets practice some Arabic examples.

أَثْ

A and thhh makes Ath

 

اِذْ

I and dh makes Idh

 

تَوْ

Taw 

 

شَيْ

Shay 

 

دَوْ

Daw  

 

أُفْ

U and Ff makes Uff

 

أَأْ

This one is a tricky one. A and au makes au. It’s like a half pronounced a. 

 

اِأْ

Another similar one, iu

 

أُأْ

And this one is Ua

 

مِنْ

Mi and N makes min

 

دَمْ

dam

 

أَلْ

A and l makes Al.

So if we put a kasra it becomes ali أَلِ, if we put a dhammah it becomes alu أَلُ and fatha becomes ala أَلَ. And a sukoon it is Al أَلْ